A calf issue for Petr Čech is allegedly what kept the goalkeeper on the bench against Olympiacos on Tuesday night.

The 3-2 defeat saw David Ospina drop an absolute howler with the score at 1-1 shortly before half-time, but Wenger has claimed his first choice goalkeeper had a minor injury concern.

The goalkeeper should be ok for Sunday, but the injury suffered by Laurent Koscielny in the 3-2 loss is much more concerning. After about an hour the Frenchman went down holding his hamstring and had to be replaced by Per Mertesacker.

On Sunday, the Gunners face Manchester United in the Premier League.

Mertesacker is thankfully back after over a month out, while Gabriel can return to domestic duty after suspension ruled him out of the match against Leicester City at the weekend.

Those two would be likely to make up the centre of the defence, but an injury to Koscielny would still be extremely concerning and a boost for Manchester United and new striker Anthony Martial.

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