The Manchester United man beat off competition from Arsenal's Mikel Arteta, Aston Villa head coach Unai Emery and Bournemouth boss Andoni Iraola to land the trophy.
A public vote was combined with those of a panel of football experts to decide the victor for October and, following three wins out of three, against Sunderland, Liverpool and Brighton & Hove Albion, Ruben came out on top.
Ruben was presented with his trophy at Carrington and was quick to praise the people around him for their part in ensuring he received the accolade.
"I'm really happy," he told club media.