Essien found the top corner at Stamford Bridge to help Chelsea set an English record of 64 unbeaten home matches in the league with a 3-2 win, but he then was substituted with 21 minutes remaining.
"It was something in the knee ligament," Mourinho said. "He was in pain, I had two midfielders on the bench so I made the change immediately but if you asked me, I don´t know if he´d be fit for Wednesday against Reading."
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