Alexis Sanchez returned to Arsenal to haunt his former club by playing a key role in Manchester United victory at the Emirates Stadium.
The Resurgent Red Devils who are on a seven-match winning streak started on a bright note when Lukaku and Sanchez combined to allow the former Arsenal star to give Manchester United the lead few minutes later, Jesse Lingard scored the second goal.
Aubameyang scored a late consolation goal in the first half, Arsenal toiled for an equaliser but United were dogged.
Anthony Martial scored the third goal to confirm Manchester United passage to the Fourth round of the FA Cup.
Arsenal’s only chance of silverware is the Europa League they are mathematically out of the running for the league.