Arsenal goalkeeper Petr Cech is a doubt for the north London derby against Tottenham due to a calf injury.
The 35-year-old was withdrawn after 70 minutes of Arsenal's 5-1 win over Everton on Saturday and the problem is still troubling him.
According to his manager Arsene Wenger , Cech has not trained at all this week and could now miss the crucial clash with Spurs on Saturday.
That would mean back-up goalkeeper David Ospina would take his place at Wembley.
Wenger said: "Cech is doubtful. He has not trained so I don't know.
"I've no problem with playing Ospina and I will make my decision on Friday.
"I will not take any risk if he is not 100 per cent because I have full confidence in David Ospina."
Tottenham v Arsenal is live on talkSPORT at 12:30 (GMT) on Saturday 10 February