The Austria international was a reported target for the Red Devils during the off-season but shared little concern for his former manager's plight
Marko Arnautovic had no sympathy for his old boss Jose Mourinho after he crowned a 3-1 win for West Ham that piled further pressure on the Manchester United manager.
Against an abject Red Devils side, the Hammers secured a big win at London Stadium, with Felipe Anderson opening his Premier League account through an impudent backheel and Andriy Yarmolenko seeing his strike deflected past David De Gea off Victor Lindelof before half-time alone.