Emiliano Martinez kept a clean sheet and picked up a massive win for Arsenal in their bid to make it through to the knock out stage of the Champions League.
Yaya Sanogo scored his first Arsenal goal against Dortmund early but went off with an apparent hamstring injury in the late going. He is currently being assessed.
Mikel Arteta is again facing an injury situation of unknown severity as he asked to come off about 15 minutes from time on Wednesday.
Danny Welbeck was not fit enough to make the squad for Arsenal's critical Champions League match with Borussia Dortmund on Wednesday.
Laurent Koscielny must be ahead of schedule in his recovery because Arsene Wenger has deemed him fit enough for a place on the bench against Borussia Dortmund in Wednesday's Champions League tie at the Emirates.
Jack Wilshere could be out for anywhere from three weeks to four months depending on what a scan reveals later this week.
Jack Wilshere's injury may render this irrelevant but it is worth noting that for an important match, Santi Cazorla was left out of Arsene Wenger's starting line-up.
Alexis Sanchez may not have come out on top against Manchester United but he continued to delivery for fantasy managers.
Wojciech Szczesny suffered a double whammy on Saturday as the goalkeeper was not only taken out by his own defender resulting in the opening goal at home to Manchester United but the injury forced the Polish international off with less than 15 minutes gone in the second half.
Olivier Giroud scored Arsenal's only goal against Manchester United in stoppage time to mark his return to competitive action.
Jack Wilshere played well but couldn't convert when it counted and then suffered yet another ankle injury as Arsenal fell to United 2-1.
Danny Welbeck (hamstring) and Alexis Sanchez (travel) will be assessed ahead of Arsenal's match with Manchester United with neither being 100% certain of starting.
Theo Walcott's injury issues continue with news that the attacking player is doubtful for Arsenal's Week 12 match against Manchester United.
Former Manchester United forward may not be fit to face his former team on Saturday after being substituted against Scotland on Tuesday.
Arsene Wenger indicated today that Laurent Koscielny and Mathieu Debuchy are about three weeks away from full group training.