United have struggled offensively without Marcus Rashford, who could be out for the season with a back problem.
Martial has carried the load on his own, scoring in their last two games.
But he got very little help in a 1-1 draw against Club Brugge away from home in the Europa League on Thursday night.
"It was a good goal today," said the United manager to reporters about Martial after the game.
"He wasn't really in the game before he scored the goal. We didn't make enough runs in behind to create enough space for Anthony and it was a frustrating night for him until then.
"You've got to be patient as a striker. Sometimes you want to drift wide, get that touch of the ball, but that's not the job of a striker.
"You've got to be patient, you've got to be concentrated when the chance comes and I think he scored a good goal today, created one or two chances, but of course the runs have got to come around him and maybe there are not enough of them."