Thomas Partey will undergo specialist consultations on a thigh injury which threatens to sideline the Arsenal midfielder for a considerable spell.
The Ghana international was forced off during Monday's 3-0 Premier League defeat at Crystal Palace.
Partey now faces a race to be fit to help the Gunners in their quest to finish in the top four and seal a return to the Champions League.
'Our No. 5 was substituted during Monday night's game against Crystal Palace at Selhurst Park after aggravating his right thigh,' an Arsenal statement read.