Thomas Partey is a doubt for Arsenal's Champions League quarter-final second leg against Real Madrid after picking up an unspecified knock in their 1-1 draw against Brentford on Saturday.
The midfielder, who opened the scoring for the Gunners with a second-half strike, was substituted off on 69 minutes.
It's a major concern ahead of Wednesday's showdown with the 31-year-old all but certain to start against the Spanish giants if he were to be available.
'He (Partey) felt something so we didn't want to take any risks,' said Mikel Arteta.