N'Golo Kante has picked up a hamstring problem and could miss Chelsea's Premier League trip to Crystal Palace.
The France midfielder trudged out of Chelsea's 3-0 win over Watford, and could now sit out Tuesday's trip to Selhurst Park.
Olivier Giroud, Willian and Ross Barkley all found the net as the Blues eased past the Hornets, to jump back into the league's top four and shake off Wednesday's frustrating 3-2 loss at West Ham.
Kante's injury proved perhaps the sole blow in Chelsea's comfortable Saturday night victory at Stamford Bridge, leaving Lampard sweating on the 29-year-old's fitness.