"But I have to say it was probably one situation where we failed to control them and they scored. If we don't qualify for the Champions League, it will be a big disappointment", Cech told the British media.
"We make a good performance; we play like you have to play a final". I am very proud for the players.
Asked if the ball had stayed in play, Toure was in no doubt: "Definitely, and it was a penalty and something more".
Arsenal are still seven points adrift of fourth in the Premier League and have a tricky run-in which, as well as Spurs, includes matches against Manchester United and Everton. "I think we are going to be under pressure in every game now", he said.More news: Supply ship named for John Glenn arrives at space station
City looked to have put the controversy behind them as Aguero raced onto a long pass from the outstanding Toure to put City ahead just after the hour.
Rather than be cowed by the deficit Arsenal roared back, Monreal converting Alex Oxlade-Chamberlain's cross to swiftly equalise before Alexis Sanchez scrambled home the victor in added time. "It was a very tight game, but overall I think we deserved to win the game".
City manager Guardiola provided an update on the duo's status after his side's FA Cup defeat to Arsene Wenger's men.
The derby clash between City and United will be of great importance for both the teams as they fight with other teams for a berth in next season's Champions League.More news: European Union divided on Britain's election announcement
Defeat means Manchester City's focus switches to the Premier League, where they are now fourth. United are doing well, Arsenal are going to have confidence and Liverpool lost but it is not finished yet.
"It is going to be hard, it's very tight", he said. "This league will be very, very tough and very, very close".
"We had a hard period where the team was losing games it should have not lost and obviously you come to the situation where you play under pressure and need to find a way out. I think everybody showed that it's not only about coming to take part in a semi-final and hoping it is going to be your day". The pair were substituted at Wembley with a hamstring injury and dead leg respectively.More news: Israel marks Holocaust remembrance day with somber ceremony