Frank Lampard says Chelsea must get back to their best to trouble Man City

Frank Lampard is hoping for a confidence-boosting result on Sunday (Richard Heathcote/PA)

Frank Lampard admits Chelsea’s players are in need of a mental boost ahead of Sunday’s clash with Manchester City.

After a 17-game unbeaten run that saw them touted in some quarters as Premier League title favourites, Chelsea have lost three of their last five games, winning only one.