Nolan told the club's official website: "I am determined not to do what I did at Blackburn and put myself in this situation again.
"You've got to learn lessons when you make mistakes and it was a big mistake.
"Hopefully I will come back a better player and a better person. I've learnt my lesson now, I'm sure of that, and I just hope it can have a positive effect on me and prevent me doing anything like that again for the rest of my career."