Fernando Torres is expected to miss Chelsea's Champions League tie with Schalke on Wednesday after limping out of training with a muscle problem.
The Spanish striker, who scored twice in the 3-0 victory over the Germans in the reverse fixture a fortnight ago, pulled up midway through a practice session on Monday and had to receive medical treatment.
According to the The Mirror, he is likely to be unavailable for the visit of Schalke, who are level with the Blues at the top of Group E, having won two of their opening three games, and possibly the Premier League clash with West Bromwich Albion on Saturday.
Torres has been showing signs of returning to somewhere near his best in recent weeks, but his potential absence could give Samuel Eto'o the chance to impress in Chelsea's lone striker role.
Eto'o's probable inclusion in the team at Stamford Bridge could be one of several changes made by Jose Mourinho to the XI that he heavily criticised after the 2-0 defeat to Newcastle United on Saturday.
Joe Fish
