Gary Cahill could miss Chelsea's FA Cup trip to Man City on Saturday with an injury he picked up at West Brom on Tuesday.
The England defender suffered a slight problem during the second-half, but decided to continue playing.
"Once I got the knock, I was struggling from then on," he told the Evening Standard.
"It happened when a West Brom player went for a header and I was on the floor. He landed just inside my knee/calf. It is sore and we'll see what it's like today."
Meanwhile, Cahill's central defensive partner John Terry is expected to return from injury for the fixture.