Manchester City recorded a 2-0 win over Middlesbrough at Riverside Stadium to book their ticket for the semi-finals of the FA Cup.
Silva put a dominant City ahead after only three minutes before Aguero got the second after 67 minutes.
'He has shown he can win titles in Spain with Barcelona and with Bayern Munich in Germany and he probably thought he would do the same in England, ' he added.
The Mancunian did not give it up against his first club - just as he will not do against the red side of Manchester this coming weekend as he and his team-mates seek to rescue Boro's ailing league campaign against Mourinho's men. They have recorded back-to-back 3-1 wins in the Premier League and are looking more like the team that stunned the watching world last season. Now in that moment we have two games every two or three days, we do not have a lot of time.
Asked about the omission of Downing - a player with whom he has not always seen eye to eye - and Bamford, a £6m January signing from Chelsea, Karanka said he will pick only fighters who want to "fight for the team".
Brendan Rodgers proud despite conceding late goal
He said: "It could have been a wee dig at Rangers ". " Clint Hill said on the pitch to me afterwards that he got away with that". It's disappointing for myself that I had two one-on-ones.
But Zabaleta has confirmed that City will not change how they play and will still look to score goals: "We're not going to change our style of play", said the Argentinian.
The big boost for the away side is the return to fitness of defensive rock Vincent Kompany, who could play in his first match in as many as six weeks on Saturday.
City came into the match on a 10-game unbeaten run across all competitions and made the ideal start after opening the scoring inside three minutes. "It's the winning mentality because now we are playing well".
It's not all about the FA Cup, they need to survive in the Premier League too, but Middlesbrough really couldn't have done much when City are in this form. The 32-year-old former Juventus and Sevilla frontman has been impressive this season for the club from south Wales despite their battle against relegation. "But if we had taken 50% of the chances we created this season, we'd be in a better position now".
"I hope it's not a serious thing, just the one knock, but I have to wait for the scans".