He added: "I didn't play the game because I was injured after my season with Chelsea.
"I went back home and had to rest my muscles because I was so tired."
Mikel admits it took time for him to adapt following his protracted move to Stamford Bridge from Lyn Oslo.
"My first season for Chelsea was a bit difficult but I started playing a lot towards the end of the season," he added.
"The team is great and the manager is a good man - everyone has helped me."