Chelsea striker Samuel Eto'o has picked up a hamstring injury.
Eto'o limped off with a tight hamstring after giving Chelsea the perfect start against Arsenal's permeable defence at Stamford Bridge.
The 33-year-old was replaced by Fernando Torres after rearing up with ten minutes on the clock, signalling a clenched fist to boss Jose Mourinho as he walked past him on the touchline to imply a muscle problem.
Chelsea went onto thump the Gunners 6-0.
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