Suárez, who joined Liverpool for £23m in January 2011 from Ajax, acknowledged on Wednesday his behaviour had let him down at times during his career but insisted he had made a conscious effort this season to clean up his act on the pitch.
"I have a very strange way of playing football," Suárez said. "I'm my own severest critic and I realise when I make mistakes.
"There are times that I get yellow cards that can influence a game. I have improved and I have to continue improving.
"You can lose some things but you can never lose the slyness, the passion that you have had since you were a kid playing in the street. If I didn't have the character that I have today on the pitch, I don't think that I would have become the player that I am today."