The England international suffered a knee injury towards the end of April and hasn’t been in action since, requiring surgery and a lengthy rehabilitation process in order to repair the damage.
When quizzed on the situation, Wenger admitted that bone bruising was extending his time on the side-lines and his setback coincided with injuries to other players is a big blow to the club.
“Unfortunately he got injured at the end of April and we are now at the end of December and he is still not available because of bone bruising,” Wenger explained.
“That deteriorated and it is a big blow to us. Especially now we could not rotate, we lost Alexis Sanchez.”
Welbeck joined Arsenal from Manchester United in the summer of 2014, a deal which raised many questions at both clubs when considering his age and first-team status.
The 25-year-old made 34 appearances in all competitions for the Gunners last season, scoring eight goals including a Champions League hat-trick against Galatasary in a 4-1 victory.
Despite not being as prolific as Olivier Giroud or quite as direct as Theo Walcott, Welbeck does offer Arsenal a different proposition upfront and his absence has been missed.
With his return date set for February, the former United striker could still have a big part to play this season and his forthcoming return could feel like a new signing for boss Arsene Wenger.