New Hammers manager Nuno handed Marshall his chance as a second-half substitute in defeat at Arsenal on the weekend.
“The game’s just done, so it hasn’t really sunk in yet, but coming over from Northern Ireland, this is what I want to do, so I’m happy that the new manager has given me my debut and hopefully there’s more to come,” the former Linfield youngster told West Ham TV.
“It’s been a long time coming, so I’m just happy that I got on the pitch. I’ve been on the bench a few times now. I was on the bench when David Moyes was here and then a couple of times under Graham Potter, but this is obviously the first time I’ve got on, so I’m just thankful to the gaffer.
“Obviously, he hasn’t seen much of me yet, but hopefully in the weeks to come when I get back from Northern Ireland duty, then hopefully he’ll get to see more of me and I can show him that I can affect games and bring a bit of energy, which I tried to do today, but it was a hard game to affect in the way the game was going.
“(With my late headed chance) I should have scored, but it is what it is. Hopefully, if I get on again, I’ll put the ball in the back of the net and finally become a Premier League goalscorer.”