Chelsea striker Diego Costa was on the pitch for only ten minutes against Stoke City before pulling up with a hamstring injury.
It was the same problem that kept him out of recent internationals with Spain and forced him to start the match at Stamford Bridge on the bench.
And despite only coming on at half-time for Oscar, the 26-year-old limped off after the 55 minute mark with a recurrence of the issue, and replaced by Didier Drogba in a match Chelsea would later go on to win 2-1.
Following the victory over the Potters, Jose Mourinho revealed Costa would likely now be out for around two weeks with Drogba or match-winner Loic Remy deputising at the head of the Blues attack.
“All the scans two days ago, the muscle and image was completely clean. The player trained twice at 100%. He did much more in training than he did in the match,” he told the BBC.
“If the result was 2-0 he wouldn’t play. The medical department do fantastic things for us. We will wait for Diego again. Next week Loic [Remy] or Didier will play.”
And when asked how long the Blues summer signing would remain in the treatment room, Mourinho said: “For sure a couple of weeks minimum. Let’s see what happens.”
The win over Mark Hughes’ side mean Chelsea are now seven points clear at the top of the Premier League with a game in hand.
Mourinho believes his side need just five wins and a draw in their remaining eight games to guarantee a first Premier League title in five years.