Chelsea boss Frank Lampard admits N'Golo Kante has suffered an injury setback.
Kante has recently returned after pre-Christmas hamstring surgery.
However, he was missing for yesterday's 2-2 draw with Nottingham Forest.
Lampard said during his pre-match interview: "We lost N'Golo in training yesterday.
"He felt something in his groin, so that's probably a couple of weeks and we know what that means pretty much."
