Dan Biggar fears a "huge step backwards" if there are no crowds allowed at matches moving into 2022.
While crowds at sporting events have yet to be capped in England, matches in Wales and Scotland are now limited when it comes to capacity, amid a sharp rise in coronavirus cases.
Wales' first minister Mark Drakeford has not put any timescale on when the restrictions will be lifted, with the Six Nations set to start on February 5.
Scotland will formally review their measures on January 11, while France – where over 18,000 people were in hospital with COVID-19 as of December 30 – has imposed restrictions on travellers from the United Kingdom, with their government insisting that all sportspeople must be fully vaccinated by mid-January in order to enter the country.
Italy, likewise, is experiencing unprecedented levels of new recorded cases of the virus as the Omicron variant spreads across Europe.
But Wales fly-half Biggar believes banning spectators would be a frustrating move that will only damage the game.
"It would be a huge, huge step backwards if there are no crowds moving forwards for clubs and the Six Nations which is obviously such a showpiece event," he told reporters.
"You saw it in the autumn, getting crowds back. Everyone coming to games now has to have a passport, they'll be double or triple-jabbed, and it's an outdoor event so I don't see why they wouldn't be allowed in.
"As long as it's safe, that's the most important thing.
"I hope for an event like the Six Nations and for the game up and down the UK moving forward we get some sort of sensible outcome.
"As long as everyone is safe and jabbed then I think it makes sense to keep crowds in. I think you would have seen a different [Northampton against Harlequins] game if the stadium had been completely empty.
"We played a lot of games with no crowds but if you look at the first handful of games they almost felt like training games.
"It felt like it did not really matter whether you won or lost because it felt like a training match and like the intensity was knocked out of it. You lose any advantage of playing at home and bits and pieces like that.
"I think it would be a huge step backwards if crowds were to go. I think the rest of the lads in Wales are pretty frustrated with it. That's normal frustration isn't it?
"We are probably getting into different things with politics now but I think everything should be aligned."
Wales, the defending Six Nations champions, start their campaign against Ireland on February 5, with their first home game scheduled for February 12, against Scotland.
Rees-Zammit relishing Mahomes advice as former rugby star eyes spot on Chiefs roster
Louis Rees-Zammit has likened Patrick Mahomes to an extra coach as he looks to make an impact in the NFL with the Kansas City Chiefs.
Rees-Zammit shocked rugby union fans in January when he announced he was turning his back on the sport to enter the NFL's International Player Pathway programme.
He was signed by two-time defending Super Bowl champions Kansas City in March and is now looking to earn a place on their roster for 2024, learning the role of running back at the Chiefs' rookie minicamp after attending another training camp alongside Mahomes.
Rees-Zammit has made sure to pick the brains of Mahomes, who has led the Chiefs to six straight AFC Championship games and won three Super Bowl rings since being drafted in 2017.
"It was amazing, all the quarterbacks and receivers were there, we were running routes, we were working in the gym", Rees-Zammit said of his experience at that camp in Texas.
"It was a great two weeks, I definitely learned a lot with Pat and the other boys."
Asked if Mahomes was acting like an extra coach, he said: "100 per cent.
"I'm new to the game so I'm trying to pick everyone's brains and try and pick up the sport as quick as possible because I want to be out there playing.
"The way I can do that is picking the brains of everyone that's currently here and trying to learn the game as quickly as possible."
Chiefs head coach Andy Reid has been impressed by Rees-Zammit's attitude, saying: "He's so diligent with everything and wants to be so good at everything. I appreciate that.
"I like the fact he's got shorter steps initially, that's a good thing as a running back. If you're a long strider in there you've got to really work on making it through those tight adjustments you have to make. He seems to have a nice feel."
England and Saracens number eight Vunipola fined after arrest in Mallorca
England international Billy Vunipola has confirmed he has been fined after an incident which saw him arrested in Mallorca on Sunday, with his club Saracens set to launch an internal investigation.
On Monday, widespread reports claimed Vunipola had been tasered by Spanish police in the early hours of Sunday morning, with an altercation taking place after he left a club in Palma.
Saracens later confirmed they were aware of an incident and said they would deal with it internally.
The number eight, who was born in Australia but has represented England 75 times, later released a statement of his own via his club, denying that any violence took place and confirming the police investigation was now closed.
"I can confirm I was involved in an unfortunate misunderstanding when I was leaving a club in Mallorca on Sunday, which got out of hand," that statement read.
"Contrary to media reports, there was no violence, no fight and I did not threaten anybody at any stage, with bottles or chairs or anything else.
"I was charged with resisting the law and, following an 'express trial', I have paid a fine of €240. The Spanish police investigation is now closed, and I am flying back to the UK today.
"I will obviously cooperate with the Saracens internal process and unreservedly apologise for any inconvenience to all involved."
Fraser Brown ‘hugely proud’ of Scotland career as he announces rugby retirement
Fraser Brown declared himself “hugely proud” of his Scotland career as he announced his retirement from professional rugby.
The 34-year-old Glasgow hooker has not played since rupturing his anterior cruciate ligament while playing for the World XV against the Barbarians at Twickenham last May and he has now conceded defeat in his bid to return to action.
Brown won 61 Scotland caps, with the first of them coming against Italy in 2013 and the last in the Six Nations match at home to Ireland in 2023, the same game incidentally in which Stuart Hogg won his final cap. The front-rower went to both the 2015 and 2019 World Cups.
“When you have a serious injury like I did with an ACL at the end of your career, it is always going to be hard to come back from,” Brown told Scottish Rugby.
“That probably made it a little easier to announce my retirement but it’s still a surreal and strange feeling.
“I’m hugely proud to have played so many times for Scotland during my career. To get one cap was great, but then my second one came against the All Blacks at Murrayfield which was such a special occasion.
“To reach 50 caps was a big moment as I had to deal with a lot of injuries throughout my career and to be part of the growth process of the team which has resulted in where they are now has been cool.”
At club level, Brown made 141 appearances for Glasgow after joining from Edinburgh in 2011.
The hooker helped them win the Guinness Pro12 in 2015 with victory over Munster in the final in Belfast, while his last appearance for Warriors proved to be last season’s Challenge Cup final defeat by Toulon in Dublin.
Glasgow head coach Franco Smith paid tribute to Brown, saying: “Fraser is the epitome of a modern professional and someone who should serve as a role model to any young player starting their journey.
“The respect with which he is held, not only within the Glasgow Warriors community but within the wider rugby family, should serve to underline the achievements he has earned throughout his career and the manner in which he has achieved them.
“His work ethic and determination to bring the best out of the people and players around him has been clear to all throughout his career.
“I wish him the very best for whatever comes next and I know he will apply that same work ethic and determination that made him one of this club’s most distinguished Warriors.”
Brown becomes the second experienced Scotland front-rower to announce his retirement in the space of a month after Edinburgh prop WP Nel recently revealed he would be hanging his boots up at the end of this season.
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