The West Brom boss believes the Dutchman will be given the time David Moyes never got but needs to get United closer to the top of the Premier League.
After a difficult start, the 20-time top flight champions are fourth in Van Gaal’s first season and look set to return to the Champions League after finishing seventh last year.
Van Gaal has ridden out a tough start but Pulis, who takes West Brom to Old Trafford on Saturday, is adamant he needs to deliver next season.
“Louis has obviously spent a bit of money and brought quite a few players in, I think he has had a year to look at it,” Pulis said.
???The difference from himself and Jose Mourinho was that Jose knew the league. This is Van Gaal’s first season in the league. Next year he has to come close to winning the league – he’ll know that.
“It’s been great experience for him this year. I’m sure he’ll add a few players to the squad next year. They’ll want to win it, I see them getting stronger, I can’t see them getting weaker.
“David didn’t get it (time), but Louis has, most probably on the basis he has been successful at bigger clubs. He’s won major titles at bigger clubs. He’s earned it by what he’s done elsewhere, that’s a fact of life.”
Pulis has a few injury doubts, but refused to name them, although Youssouf Mulumbu is back from suspension.