Pep Guardiola welcomed the show of support for Oleksandr Zinchenko as the Ukrainian defender captained Manchester City in their FA Cup win at Peterborough United.

With his country experiencing a Russian military invasion, Zinchenko stepped up to assume leadership on the football pitch after being handed the armband by Fernandinho.

It was a move designed to show solidarity with the 25-year-old as he waits for news from what Guardiola described as "this nightmare" in Zinchenko's homeland.

"It's not an easy period for Oleks," Guardiola told a news conference. "His family, his country, but playing football is the best for him at the moment."

In a separate BBC interview, Guardiola said of the left-back: "Unfortunately his citizens in Ukraine are living in a terrible and crazy and insane situation. All the people here at Peterborough, not just our fans, showed him warmth.

"Hopefully this nightmare can finish as soon as possible."

Goals from Riyad Mahrez and Jack Grealish in the second half carried City through to the quarter-finals.

Both were set up by Phil Foden, whose pass to Grealish for City's clincher particularly caught the eye.

Grealish later revealed it was inspired by watching clips of Guardiola's former Barcelona charge Lionel Messi in action.

"The pass from Phil was excellent. It was quite similar to the pass from Phil that he did to Joao [Cancelo] in Brugge in the Champions League, and the control was excellent from Jack," Guardiola said.

The City boss added: "They were brilliant goals. The quality for Riyad and the second goal the same. It was good.

"We created chances. All of them were brilliant. Riyad always had this quality in the final third – he is the best player in the final third that we have. He scored a fantastic goal. I'm so proud for the game he played."

There was cause for slight concern ahead of Sunday's derby against Manchester United, with Guardiola substituting starting centre-backs Ruben Dias and Nathan Ake at half-time due to what he hopes are only minor knocks. Aymeric Laporte and John Stones proved capable replacements.

The City manager said Dias was "not feeling good in his leg", while Ake suffered a blow when committing a first-half foul.

"That's why, for caution and to be alert, we made the substitutions," Guardiola said. "It was not planned. I would say it was a medical decision."

Jack Grealish needs to stop concerning himself with statistics and public opinion and focus purely on his contribution to Manchester City, says Pep Guardiola.

City forked out a reported £100million fee to land attacking midfielder Grealish from Aston Villa in August.

Grealish has managed three goals and three assists from 25 games across all competitions, numbers the England international himself recently suggested do not back up his own personal feeling that Guardiola has improved him as a footballer.

But the City boss says Grealish should take a step back from being too enamoured by the statistics alone.

"Maybe he's wrong. Maybe he listens too much to what people say. It's wrong but the statistics are better and he plays quite similar to Aston Villa in terms of ball contact," Guardiola said.

"He had the chances against Crystal Palace in 20 minutes to score three goals. It didn't happen but it's going to happen. 

"We didn't buy him to score 45 goals. He doesn't have that quality he has another one."

Grealish has missed the past three weeks with a shin problem but is in contention to face Peterborough United in the FA Cup fifth round on Tuesday.

Guardiola is of the opinion that Grealish is not alone in focusing too much on the hard numbers.

"Always we talk about the statistics – the players today play for the statistics but this is the biggest mistake they can do," he added.

"We're involved in that. Statistics are just a bit of information that we have but there are players that make the team play good and they are not into statistics. But the players say how many goals I score or how many assists or...

"With these kinds of situation, they forget everything. Statistics never existed before. It's how you play today if you perform to your maximum, to your best, help your team-mates to make the process defensively and offensively better – it's enough. Thanks to that we are going to win.

"Everyone has agents and managers and everything and say what they have to do better and they listen to a lot of things about what they have to do. 

"He's playing good. I would tell him – I wouldn't tell you – if he's not playing good, but that's not the case."

Pep Guardiola admitted Everton should have had a penalty for handball against Rodri in Manchester City's win at Goodison Park on Saturday.

Phil Foden struck eight minutes from time to seal a 1-0 victory for the leaders that moved them six points clear at the top of the Premier League.

Everton were denied the chance for a late equaliser from the penalty spot when neither referee Paul Tierney nor VAR felt Rodri should be punished for the ball striking his arm in the City box.

After the match, Guardiola felt the decision likely went in his side's favour due to offside in the build-up, but the Premier League clarified that the penalty was not awarded simply because there was insufficient evidence to show the ball struck Rodri below the level of his armpit, which is used as a cut-off point for handball.

Everton reportedly lodged a complaint with the league over recent refereeing decisions after boss Frank Lampard was left furious following the City defeat.

While Guardiola dismissed the idea that the decision could have lasting consequences for the season, he accepted Everton were unfortunate.

Speaking ahead of City's FA Cup clash with Championship side Peterborough United, Guardiola said: "Can this episode affect a whole season? I will review a lot of incidents. It looks offside for Richarlison; if it's not offside, it's a penalty."

Guardiola's men meet Peterborough on Tuesday aiming to reach the quarter-finals of the FA Cup for the fifth time since he took over as manager in 2016.

Goalkeeper Zack Steffen will miss out through injury, but Oleksandr Zinchenko is set to play after being an unused substitute against Everton.

Guardiola said it would be a good chance for the Ukraine international to "show the reason why he is here", adding he was a "magnificent player" who has remained committed amid the crisis in his homeland following Russia's invasion.

The City manager also paid tribute to Marcelo Bielsa, who left as Leeds United boss on Sunday following a dreadful run of results that culminated in a 4-0 home defeat to Tottenham.

"I'm so sorry for him," he said. "His legacy is there in the Leeds city, the club, the players. His influence is massive.

"Unfortunately, the manager goes by results and, lately, it was not good. The game he has played for three, four seasons in Leeds was spectacular to watch and of course, I wish him all the best.

"It will be a loss to Leeds and his players. As a person, he's not different to anyone. Results dictate our future."