Midfielder made his first appearance since West Brom loan was terminated.
Serge Gnabry made his return to action for Arsenal last night, featuring for their under-21 side.
The German had his loan deal at West Bromwich Albion terminated earlier this year but has not featured at all at any level since returning for the Gunners.
He was a starter for the under-21s last night, but was unable to prevent them losing 1-0 to a talented Aston Villa side.
It is two years since Gnabry broke into Arsenal's first team, and his progress has stunted after a difficult 18 months.
He was injured for several months last season and played only for the under-21s, and his loan spell at West Brom was a disappointment.
The German under-21 international, now 20, made just one Premier League appearance, a 12 minute cameo as a substitute, and two Capital One Cup starts.
Fans had wondered whether he would work his way into the Arsenal first team upon his return, but he has slipped below Joel Campbell and Alex Iwobi in the pecking order, and needs a sustained run of games for the under-21s to prove himself worthy of a call up. Unfortunately for him, by time he does so, the season could be over.