The winger has been something of a revelation for Slaven Bilic’s side this season, with a series of impressive performances in the side.
It didn’t start off that way though with him initially struggling to get into the side at the beginning of the campaign.
However, a substitute appearance against United turned things around for him and he says that game at Old Trafford was certainly the turning point in his Hammers career.
“It’s always been one of my boyhood dreams to play at Old Trafford and I managed to get on during that game and before that I wasn’t really playing,” he told whufc.com.
"It was definitely a turning point for me and that was the game that got me into the team and earned me a couple of starts.”
“From there, I haven’t looked back and now I’ve got seven goals this season (for West Ham) so far and I hope I can keep adding to it.”
Antonio will now be hoping to enjoy another enjoyable afternoon at Old Trafford when the two sides clash on Sunday.
They meet in the FA Cup looking to secure a place in the semi final, with the Hammers determined to win the competition as a send off for Upton Park.
They will be confident of getting a win as well, with their form of late making them firm favourites to beat Louis Van Gaal’s side once again.