The Scot was sacked at the end of last season after the club finished eighth in the Premier League, having won the club's first trophy in six years with victory in the Carling Cup.
However, the campaign was dominated by the Suarez issue which resulted in the Uruguay striker being banned for eight matches having been found guilty of racially abusing the Manchester United defender Patrice Evra.
"I can go to sleep at night knowing what I did I did to the best of my ability and if that does not come up to their expectations or they want to go in another direction - they own the club.
"The owners made the decision they thought was best for the club.
"They don't want to make a decision which is detrimental to the club because if they did that they would hang themselves because they have a huge investment in it."