He said:
"I still feel that we want to give our best to the end of the season. At the moment, Chelsea don't look like dropping seven points - but you never know.
"The only chance we have is to believe we can come back and give everything in every game. Of course, it's not easy - but if you want an easy job then you should stay at home. This job is for strong men.
"I feel that giving up and saying they had won the title now would be criminal. It would not be professional - it would be absolutely disastrous.
"Things change quickly in football, but only if you believe and give everything. At the moment, they do not look vulnerable - but we went through a period like that and then suddenly looked very vulnerable again.''