Declan Rice has sparked worrying injury concerns at Arsenal as he limped off in their thrashing of Crystal Palace.
The former West Ham captain pulled up during the game and footage appears to show him say to Emile Smith Rowe 'hammy'.
The Gunners went on to win the game 5-0 thanks to two late goals from Martinelli after the 90th minute.
The win sees them go just two points off Liverpool who are still top of the league tabe.
But Mikel Arteta will be hoping his star midfielder's apparent injury is not too serious.