The Hammers are coming into the game with two successive league wins over Birmingham and Hull.
“I said a few weeks ago when we were on a bit of a bad run of results that, if we could put two wins back-to-back, we could really go places,” said Parker.
“We’ve now got those two wins back-to-back and hopefully we can push on.
“We’ve got a tough game at Manchester United and we go there with massive confidence. We’ve had two good results against an in-form Birmingham and we came out worthy winners on Saturday, so we go there with confidence.
“We all know how hard it is going to Old Trafford and they’re coming off a little stinging at Everton but we’ll go there and see what we can do.”