Forssell told the Official Birmingham website "I am proud to be a Chelsea player but by being able to play on a regular basis for Birmingham City it has enabled me to improve my game and become a better player.
"I feel that another year working with Steve Bruce can only aid my development even further. Steve Bruce's coaching and support has been fantastic for me and I believe that he is one of the best young managers in the game and there is still a lot more I can learn from him.
"I believe this deal is in the best interests of all three parties. For me personally I have progressed as a footballer and staying in the midlands for a further year can only be good for my consistency and stability.
"I have had the most fantastic time at Birmingham City and the fans have taken me to their hearts for which I am grateful and I hope that I can continue to repay their support.
"The players and backroom staff at Birmingham City have achieved a great deal this season and with the likely additions to the squad in the summer, I am confident the club is about to move on to a higher level.
"I would like to thank everyone at Chelsea and I will be watching them in the Champions League and cheering them on.''
Despite the way he has been treated, Mikael still has nothing but good things to say about Chelsea! He doesn't deserve to spend another year trying to understand what Brummie's are saying to him!