Everton went down to ten men after just 13 minutes when midfielder Idrissa Gana Gueye was shown a straight red for slapping teammate Michael Keane.
Shortly after, Keirnan Dewsbury-Hall have the visitors the lead with a love striker from just outside the box, and Everton held on from there.
Tuchel was in attendance to watch the game at Old Trafford, scouting potential players for England’s World Cup squad next summer.
After the game, he was spotting in deep conversation with Grealish, 30, and Garner, 24, who will doubtless be hoping they make the cut.
Garner hasn’t yet been handed a call-up to England’s senior team, but his fine form so far this season has left Everton fans pushing the agenda.
