Could Arsenal's injury problems force them to field an inexperienced bench against Tottenham?
Midfielder Glen Kamara was one of three unproven talents to feature in Arsenal's training session just over 24 hours ahead of their clash with Tottenham Hotspur.
The Gunners have several players out with injury, including Alex Oxlade-Chamberlain, Jack Wilshere and Theo Walcott, and manager Arsene Wenger finds his squad stretched.
Kamara is a Finland under-21 international who made his debut for Arsenal in the recent Capital One Cup clash away to Sheffield Wednesday, a surprise 3-0 defeat.
That loss did not stop Arsene Wenger persisting with Joel Campbell, who could start his first North London derby on Sunday.
Also featuring in the training session were winger Alex Iwobi, and summer addition from Lens, Jeff Reine Adelaide.
Arsenal go into the game keen to avenge the last Premier League meeting against Tottenham, a 2-1 loss. The last time they played though, the Gunners won by the same scoreline, with Mathieu Flamini netting both goals in a Capital One Cup win.