Jose Mourinho said Chelsea suffered from a Champions League hangover as it was forced to settle for a point at Sunderland.

The Premier League leader stretched its advantage at the top to seven points with Saturday's 0-0 draw at the Stadium of Light, a 20th game unbeaten to start the season.

Mourinho sent out an unchanged lineup less than four days after the 5-0 romp over German side Schalke guaranteed its place in the knockout stages of European soccer's top club competition.