He told the Daily Mail: "I thought Chelsea were nervous on Sunday, despite the atmosphere generated by the crowd.
"But if we look at what happened in the game I think that our seven yellow cards were too many because all the hard play was coming from Chelsea.
"I don't think they have accepted and fully come to terms with their double failure last season.
"They had two battles and lost them both and that's hard.
"I think we were better team on Sunday and Chelsea were a bit lucky to get a draw."