Arsenal captain Cesc Fabregas didn't appear at training this morning.

Fabregas has a hamstring injury and, despite having intensive treatment, was missing from the club's final session before the Champions League qualifier with Celtic.

Fabregas could now be out for three weeks, missing Saturday's crunch trip to Manchester United.

Alex Song, rested from Saturday with a knock, also trained and Tomas Rosicky was a surprise in the party after a hamstring problem.