The England international says he will give everything to get three points for his new club.
“At the end of the day it's another game – 11 players on a football pitch against another 11 players – so I'm going to give my best and try to win.
“Paul McGuinness, my youth team manager at United, would always say 'play the game, not the occasion' and that's something that's always stuck with me.
“So I'm not going to allow the occasion to get into my head.
“Someone said the other day that maybe the script is written for me to score my first Watford goal against Arsenal, but the script writers aren't playing the game so I'm just going to give my best and try to win the game for Watford."