The new deal will keep the 22-year-old at the club until 2014.
“It was easy to commit to because I am happy here and when the opportunity came it was good to sign after speaking to the club,” Mikel told Chelsea’s official website.
“My future with the new manager will be bright and I think we have a good working relationship already.
“All the managers I have played for here have their own type of systems they want us to play, and whoever comes in will want to change little bits and pieces.
“There is not much to change but they all bring in different views, and the new manager wants us to play in a certain formation which we need to get used to before the season starts.”
