UEFA has opened an investigation after Inter supporters were denied entry to Tuesday's Champions League tie with Porto despite having tickets for the match.
Footage emerged on social media ahead of the last-16 second leg showing hundreds of fans queueing to get into Estadio do Dragao as the game kicked off.
Porto had announced earlier in the day that Inter spectators who had purchased tickets in the home end, even if through the club, would be turned away.
But Inter claim an agreement was reached for their fans to attend the game if they wore neutral colours.
European football governing body UEFA confirmed on Wednesday that the matter is being looked into.
“UEFA had been made aware that a large contingent of visiting supporters had procured tickets in home sectors of the stadium," a spokesperson said.
"The UEFA regulations stipulate that five per cent of the stadium capacity must be provided to the visiting team in a segregated area for their supporters.
"The responsibility for the safe and secure management of spectators and the associated ticketing policy are determined by the match organiser and the relevant authorities.
"Mitigation measures were discussed between both clubs. UEFA is currently looking into the matter."
Inter claimed a goalless draw to advance through to the Champions League quarter-finals as 1-0 aggregate winners.
The Italian club's chief executive Beppe Marotta dedicated the result to those who were unable to get into the ground.
"We celebrate this passage that Inter had not achieved for 12 years, we give the credit to our coach, our players and the fans who were present," he told Sky Italia.
"I also want to spare a thought for circa a thousand fans who were left outside the stadium even after regularly purchasing a ticket.
"I saw footage of families who were locked outside, children crying who had flown here from Italy.
"Football must represent unity and joy, so this is a bitter page in what was otherwise a wonderful evening.
"We had met with the local authorities this morning and they assured us the fans would be allowed in even beyond those limits of the away section. Instead, this did not happen.
"These were for the most part families with children, who certainly weren't here to perpetrate acts of violence, but to support their team.
"I don't believe the situation was so serious as to ban their entry.
"We realise UEFA are not to blame, but we feel that with a formal complaint we can prevent this sort of thing ever happening again."
Borussia Dortmund gearing up for crucial clashes against RB Leipzig and PSG
Borussia Dortmund are bracing for their two most important matches of the season.
Saturday's game at RB Leipzig in the Bundesliga is followed by a Champions League semi-final first leg at home to Paris-Saint Germain on May 1.
With the league title already wrapped up by runaway leaders Bayer Leverkusen, attention has shifted to the battle to qualify for the European competitions next season.
Dortmund's unexpected success in Europe has thrilled fans but the team's future in the continent's top club competition beyond this term could rest a lot on the result against Leipzig.
BVB are in fifth place on 57 points with Leipzig fourth on 59 and four games left in the campaign. The top four teams qualify for the Champions League group stage, although Germany is likely to earn a fifth spot as one of the top two in UEFA's coefficient table depending on the remaining results in European competition this season.
A Dortmund defeat against Leipzig would see them drift five points behind their rivals with three games remaining, so Edin Terzic's side are aiming to keep hot on their rivals' heels.
"It is a very important, decisive game against Leipzig," said Dortmund defender Nico Schlotterbeck.
"They are our direct rivals and it is a big difference for us finishing fourth or fifth.
"We lost against them earlier in the season and now we want to win this. It is the fight for fourth place."
Dortmund conceded a last-gasp equaliser in last week's 1-1 draw against Leverkusen but have won five of their last seven league games, including a 2-0 victory over Bayern Munich.
"It is extremely important for us to keep trying with 100 per cent to get that fourth place," said goalkeeper Gregor Kobel.
"We cannot sit back and relax until we have achieved that. We must maintain focus and step on the gas."
RB Leipzig chief determined to seal top-four Bundesliga finish
RB Leipzig are determined to wrap up a top-four Bundesliga finish, despite fifth spot possibly earning a place in next season's Champions League, the club's chief business officer said on Thursday.
Leipzig, who host Borussia Dortmund on Saturday, are fourth on 59 points, two ahead of Dortmund with four games left in the season. A win would put the Saxony club firmly in the driving seat for a top-four finish.
The top four qualify automatically for the Champions League group stage, although Germany is likely to earn a fifth spot as one of the top two in UEFA's coefficient table depending on the remaining results in European competition this season.
"That (potential fifth spot) involves a lot of data and statistics," said Leipzig CBO Johann Plenge in a media call. "We are not spending too much time on this discussion."
"This is not something we take too much into consideration. We have the ambition to be a top-four club and to be that you have to finish in at least fourth place," he said.
Leipzig, who will go on a U.S. tour from July 28-Aug. 4 and will play Aston Villa in New Jersey, also competed in the Champions League this season, losing to Real Madrid 2-1 on aggregate in the round of 16.
"The match (against Dortmund) is extremely important. We are very focused and 100% confident we will give everything on the pitch," Plenge said.
"I think we have a very good situation to finish the season as a top-four club."
Plenge said for the new season the club planned to hold on to their top performers, unlike last year when several key players, including Josko Gvardiol, Dominik Szoboszlai, Christopher Nkunku and Konrad Laimer, left, forcing a big overhaul.
"We had a very intense transfer period last summer. We developed some great players [for] the Premier League. We want a less intense transfer period and to keep the players together," Plenge said.
"Having them in our team next season is what we will do in the summer."
'There are no gimmies' – Dyche warns Everton not to step off the pedal
Everton's big win over Liverpool shows they are "sticking to the task", so says Sean Dyche, who knows his team must keep their feet on the ground as they aim to overcome Brentford.
The Toffees won 2-0 at Goodison Park on Wednesday, taking a huge stride towards Premier League safety and denting their rivals' title hopes in the process.
Everton moved onto 33 points, eight clear of 18th-placed Luton Town with four games remaining.
It means that, should Luton fail to beat Wolves on Saturday, Everton - who face Brentford at home in an evening kick-off - would be able to ensure their safety with a victory.
Dyche, though, is taking nothing for granted.
Reflecting on the derby victory, Dyche said: "Well, it certainly says we're sticking to task, whatever comes at us. I'm certainly proud of that, because we've had some ups and downs ourselves.
"But it has to be parked because another one is coming around. Another important game, another chance, another opportunity to play at Goodison and get three points, so there is a lot on the next game. So they do have to have a window to enjoy that last night.
"That's the challenge. Of course, I said enjoy the moment, but I said let's go and do it again.
"It's a decent outfit in Brentford. They had a funny spell themselves and have come out of that.
"It's not easy. There are no 'gimmies' in this league. I praised the players first last night and then said 'Right, tomorrow we come in and get on with business'.
"We've taken big steps, but there are more to come. We can control the situation ourselves, and that's what we have always aimed to do - even with the points taken away and all that sort of stuff. Grip hold of it and let's run with it and I think we're beginning to show that again. Three wins out of four now: three home wins, clean sheets, good signs."
Brentford boss Thomas Frank said: "It's been a tough season - everyone is in the Premier League, no matter where you are in the table. But this season in particular because of injuries and other things that have been happening."
PLAYERS TO WATCH
Everton - Dominic Calvert-Lewin
Calvert-Lewin was immense against Liverpool, scoring for the third time in four Premier League appearances. The striker netted in Everton's 3-1 win over Brentford in the reverse fixture in September.
Brentford - Bryan Mbeumo
Mbeumo has been involved in nine goals in his last 10 Premier League starts, while Brentford have won 39 per cent of their league games when the Cameroonian has started this season (7/18), compared to 12.5% when he has not (2/16).
MATCH PREDICTION: DRAW
Brentford have scored eight goals in their last two Premier League away games, netting five on the road for the first time ever in the top flight last time out at Luton.
Everton have opened the scoring in each of their last four Premier League meetings with Brentford, doing so in the opening 10 minutes of the match on three occasions in that run.
None of the 10 league meetings between Everton and Brentford at Goodison Park have ended in a draw, with the Toffees winning seven of these to the Bees' three. However, the Opta supercomputer is predicting a draw is a likely result.
Having been unbeaten in their first three Premier League games against Everton (W2 D1), Brentford have now lost their last two against the Toffees.
OPTA WIN PROBABILITY
Everton - 32.4%
Brentford - 38.2%
Draw - 29.4%
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