Mauricio Pochettino praised Armando Broja as one of the most promising young strikers in Europe after his goal helped Chelsea to a 4-0 FA Cup third-round win over Preston.

The 22-year-old started in place of Nicolas Jackson, who is away at the Africa Cup of Nations, and netted his team’s opening goal early in the second half at Stamford Bridge.

Preston had done a fine job in the first period of containing Chelsea, who lacked cutting edge to go with their domination of the ball, but Broja’s strike was the first of three in an 11-minute spell in the second half.

Will Keane was hounded off the ball inside his own box by Mykhailo Mudryk, who laid it back for Malo Gusto to cross and Broja headed in.

Thiago Silva then nodded in a second before Raheem Sterling quickly lashed a free-kick beyond goalkeeper Freddie Woodman.

Enzo Fernandez knocked in a fourth near the end as the gulf to Ryan Lowe’s side – 14th in the Championship – finally showed.

Pochettino praised the contribution of Broja, who returned to fitness in September after nine months out with an ACL injury, and hinted there is more to come from the Albanian striker.

“It was really important for him,” he said. “I need to be honest, he needs to use this type of game to score and to feel the net and to improve. Improve not only in his fitness but his body language also. He needs to step up and to go forward and to move. He needs to smile more and be more positive.

“The potential is amazing. We’re talking about one of the young strikers in England and in Europe with most potential. But the problem now is he needs to push himself, and we’re going to try to help him to realise that never it is enough.

“He was nearly one year away (injured) and of course now he needs time. It’s not easy for him to perform and to be at the level we expect. Our expectation is massive and we really believe in him. We’re going to push him to improve every day.

“I said to him smile. Always we joke about how he needs to smile, to laugh, to put inside himself more good energy and be more happy, a happy boy.”

Preston boss Lowe reflected on a game that got away from his side in the second half after a promising start.

“The three goals in (11) minutes really hurt us,” he said. “I think for large parts of that game, before the 58th minute when they scored, we were fantastic.

“It is disappointing to lose and I don’t think the result reflects the performance, but the fact is they have good quality players who can put the ball in the back of the net.

“I thought our lads were excellent. They gave it their all and that’s the biggest thing I am pleased about.”

Mauricio Pochettino hopes Chelsea can use the FA Cup to qualify for Europe next season despite their indifferent Premier League form.

The Blues host Preston at Stamford Bridge in the third round on Saturday and will be looking for respite for what has been a mixed league campaign during the manager’s first six months in charge.

They currently sit 10th, with an 11-point gap to make up on fifth and what would be a guaranteed spot in the Europa League.

A successful cup run culminating in victory in the Wembley final in May would earn them a place in the competition next term, whilst they will also be looking to secure a back-up spot in the Conference League by winning the Carabao Cup.

Pochettino’s side face Middlesbrough in the semi-final of that competition over two legs beginning on Tuesday, with the second leg set for January 23.

But with little sign so far of the consistency that will be required over the second half of the season to qualify via their league position, cup ties during the coming weeks look increasingly critical, starting with Saturday’s meeting with the side currently 14th in the Championship.

“Of course (we can win the FA Cup),” said Pochettino. “The Carabao Cup and the FA Cup are competitions we need to try to go far.

“But we need to build our run step by step and the first step is (Saturday). It’s a really important competition for us, because we are not in Europe.

“In the Premier League, we are in a position that we need to grow and improve a lot if we want to be in Europe next season. Through the FA Cup or Carabao Cup we can achieve that.

“It’s really important because we had three competitions at the beginning (of the season) and we’re still in them.”

Pochettino confirmed there will not be wholesale changes from the team that won 3-2 against Luton last time out.

He hinted at a possible start for striker Armando Broja, with Christopher Nkunku fit only for the bench and Nicolas Jackson having departed for the Africa Cup of Nations.

Long-term absentees Ben Chilwell and Carney Chukwuemeka – out since September and August respectively – are not yet ready to return, whilst Romeo Lavia has suffered yet another injury setback after making his debut in December.

“We are going to treat it like a Premier League game,” said the manager. “Just because it’s the FA Cup and it’s a Championship team, we are going to respect Preston. You will see we are going to put in place a starting XI with all the guarantees to perform.

“Armando is going to be a possibility to play. But Christopher is not going to start. He suffered some issue during the week. We need to be careful with him after the last six months where he didn’t compete.

“We really trust in (Broja). He has an amazing potential and quality. Now he must forget his (ACL) injury from the last year and start to behave normally.

“Chilwell and Carney are not available, we’ll see for Middlesbrough and Fulham (on January 13). They’re doing well, training with the group the last few days. We are happy with their evolution.

“Lavia, we still don’t know when he will be available again.”

Chelsea needed an 89th-minute penalty from substitute Noni Madueke to edge past Crystal Palace 2-1 at Stamford Bridge and climb back into the top half of the Premier League table.

It had looked like being another frustrating home outing for Mauricio Pochettino’s side for most of the second half, after Michael Olise had cancelled out Mykhailo Mudryk’s early goal with a brilliant finish on the half-volley on the stroke of half-time.

Nicolas Jackson missed a superb chance to win it, slotting the ball wide after being set up by Conor Gallagher.

But with the game drifting towards what would have been a deserved point for Palace, there was a final twist, Eberechi Eze tripped Madueke as he sought to control the ball on the edge of the box, and the England Under-21 international won the match from the spot with his first league goal of the season.

Chelsea opened the scoring after 13 minutes, and it began with Malo Gusto slipping his man in midfield with a smart shimmy and turn.

Driving over halfway, his pass forward was wayward, but interest in Chelsea’s attack was revived by a critical slip by Nathaniel Clyne whose stumble let the ball run on. That allowed it to reach Christopher Nkunku, who fed the galloping Malo Gusto on the overlap and his centre was gratefully turned home first time by Mudryk.

The Ukraine international had made an electric start and would have made it two shortly afterwards but for a smothering block by Palace goalkeeper Dean Henderson, closing the angle well after Mudryk had been slipped in by a deft Jackson back heel.

There was a fluency about Chelsea that has rarely been seen in recent weeks. Nkunku on his long-awaited first start was at the heart of things. Fresh from his role in the opening goal, he played a wonderful ball in for Jackson, whose low drive was aimed fractionally wide of Henderson’s far post.

The France international might then have had his first Stamford Bridge goal after 25 minutes had he not kicked the turf when clean through on goal, under pressure from defender Chris Richards.

Chelsea were industrious with the ball, racking up 323 passes during the first half and recording 63 per cent possession and – unlike so often this campaign – they had created gilt-edged chances to go with it.

And yet, in the final seconds of the half, a familiar sinking feeling for home supporters. Richards went in strong on Levi Colwill to win the ball in midfield and it broke out wide to Jordan Ayew.

Palace had men in the box and the one picked out by Ayew’s laser-like aim was Olise, who brought it down confidently on his chest, took a momentary glance at Djordje Petrovic and lashed it inside the Chelsea goalkeeper’s near post to make it 1-1.

Palace were without a win in seven games but the goal, though against the run of play, brought belief.

Eze whistled a free–kick past the post as the visitors registered the first chance of the second half, as Roy Hodgson’s side went toe-to-toe with their hosts.

Pochettino left Thiago Silva on the bench for only the second time in the league this season, but called on the 39-year-old just before the hour mark, alongside Romeo Lavia, who finally made his Chelsea debut.

Armando Broja was also sent on as the spectre of another disappointing home result loomed.

Minutes later, their moment looked to have arrived. Moises Caicedo scooped a pass forward to Gallagher who had found space centrally and the captain showed a keen awareness of space to find Jackson running through, but – with only Anderson to beat – he clipped the ball agonisingly wide.

That was followed by a fine, prodded finish from Axel Disasi’s pass that VAR rightly ruled out for offside.

Broja took one down and well drilled into the side netting, after Olise had drawn a smart near-post stop from Petrovic at the other end.

Chelsea thought two more points had slipped away at home. Then with two minutes to go, Madueke went over Eze’s leg, a VAR review yielded a penalty and the substitute picked himself up knock home the winning goal.