The 33-year old was confirmed as an Arsenal player earlier today.
Speaking on the club's official site, Cech said: "It was probably the hardest decision for me to go, but last year I realised that I am not in a phase of my career when I would sit on the bench.
"I want to be playing, I want to have a chance to compete for my position in the team and I want to be useful for the team and do the usual stuff on the pitch week in, week out.
"I hope I will have that possibility to compete for my place here at Arsenal and I hope that I can bring something a little extra to the team that can help."
Chelsea’s role in his move has come as something of a surprise given the effect Cech could potentially have on Arsenal’s Premier League title chances.
It is a mark of the respect that Roman Abramovich has for Cech by allowing him the move he wanted, rather than force a move abroad to avoid strengthening a domestic rival.
Mourinho was quoted by The Guardian as saying that if it was his decison, then Cech would be staying, but it appears on this occasion Abramovich has over-ruled the 'Special One' and put sentimental values before footballing ones.
One of Cech’s main attractions to the Emirates was the possibility of working with Arsene Wenger, and the former Chelsea man explained the role of the Frenchman in convincing him to move.
"I had a good chat with him and it was the first time after the club approached me that I could speak to him in private for such a long time," the goalkeeper told Arsenal's official website.
"He made me believe that this was the right step and that this is the club with a lot of ambition. I have a lot of personal motivation and ambition and the club definitely matches it.
"It is an exciting time for me, it is a project where Arsenal fans and the club have been waiting for the Premier League title and this is a chance for me to bring my experience and my little extra to the team and we can possibly achieve that."
Talk of a Premier League title is sure to get the excitement level rising among Arsenal fans, and in Petr Cech, they may just have signed the missing piece to their puzzle.