Chelsea boss Jose Mourinho is in danger of being without key central defenders John Terry and Gary Cahill for Saturday's FA Cup clash at Manchester City.
Mourinho had hoped Terry would be fit for Tuesday's Premier League game at West Brom but the 33-year-old was again missing, with his absence felt as the Baggies staged a late second-half rally to grab a 1-1 draw.
Terry's presence is crucial as Cahill limped away from the Hawthorns with a damaged calf sustained prior to Victor Anichebe heading home an 87th-minute equaliser. He is a major doubt for the trip to the Etihad Stadium.
Cahill said: "Once I got the knock, I was struggling from then on.
"It happened when a West Brom player went for a header and I was on the floor, and he landed just inside my knee/calf. It's sore and we'll see what it's like later."
The late goal and the injury completed an unhappy end to the game for Cahill as Chelsea missed the chance to open up a four-point cushion at the top of the table.
Albion, however, performed admirably as they played the pressing game new head coach Pepe Mel has been demanding of his players, leaving Eden Hazard, the toast of the Blues following his hat-trick that sank Newcastle, to feed off scraps.
Hazard, however, believes the point could be an important one come the end of the season.
"It was a puzzling game," Hazard said. "At 1-0 I thought we were managing the match well, but we couldn't get the second goal which would have given us protection, and then the game became difficult.
"I tried to play, we tried to play, but it was a very difficult game. It was very complicated whenever I had the ball because there were two or three opponents there. They had a plan to defend.
"You cannot win every game and it was important we didn't lose. We'll improve in the future and we will try to win the next game."