Chelsea are waiting on the fitness of captain John Terry and midfielder Frank Lampard ahead of their trip to West Ham tomorrow.
Lampard's chances of facing his former club look slight after hernia surgery although manager Carlo Ancelotti is hopeful he will be available to play.
Terry, who like Lampard missed out on England's two Euro 2012 qualifying victories over Bulgaria and Switzerland, is battling to shake off a hamstring injury in time.
Both players are understood to be back in training but Ancelotti may decide not to risk them against rock-bottom Hammers.
Ancelotti is determined not to rest on his laurels after winning the double in his first season and guiding the Blues to an unbeaten start to the new campaign.
The Premier League leaders travel to Upton Park for their London derby having scored 14 goals without reply in their opening three games.
West Ham have yet to score from open play in the league this season -- having conceded seven goals.
But despite his league and FA Cup success last season, the Italian coach still believes there is room for improvement.
"In football there are a lot of things, a lot of details that you can always improve," he said.
Meanwhile, it has been revealed Chelsea rejected a bid from Marseille for striker Didier Drogba last month.
Marseille president Jean-Claude Dassier admitted he made an offer for the Ivory Coast international but Chelsea were not interested.