Eden Hazard agrees with Jose Mourinho that he hasn't performed up to the standards he established last season.

Hazard is in his fourth season with Chelsea.

"It's obvious," he told French sports daily L'Equipe. "You don't need to know too much about football to compare what I did last season and what I did this season. I'm not as good.

"It's more of a collective problem than an individual one. We're professionals. We knew this season was going to be more difficult... but within the squad we have the quality to bounce back."