Arsenal midfielder Yossi Benayoun will be unavailable for at least one week due to a side strain.
The Chelsea player only moved to Emirates Stadium on loan at the end of August and scored his first goal in Tuesday's Carling Cup win over Shrewsbury.
But Benayoun has revealed he has also sustained an injury and will be missing for at least seven days.
The Israeli is therefore set to miss Saturday's home Premier League match against Bolton and could be a doubt for next Wednesday's game with Olympiakos in the UEFA Champions League.
Benayoun said on twitter: "Very disappointed as I have a strain and will be out for a week or so."