foxsports
Arsenal have received a fitness boost after Laurent Koscielny trained with the squad ahead of their Champions League qualifier against Besiktas.
Koscielny was a doubt for Tuesday's play-off round first-leg tie in Turkey after taking a knock to his Achilles in the 2-1 win over Crystal Palace on Saturday night.
However, Kieran Gibbs did not train and it looks as though a hamstring injury will rule him out.
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Callum Chambers is likely to continue alongside Koscielny in the centre of defence. Per Mertesacker was on standby to replace Koscielny but took no part in the session at London Colney.
Mertesacker and his fellow World Cup winners Mesut Ozil and Lukas Podolski are still on extended leave
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