The typically prolific Van Persie has scored three goals in nine Premier League games this season, with United - who last won on October 5 - next up against struggling Crystal Palace at Old Trafford on Saturday.
"I shall expect a lot of him," Van Gaal said of his Dutch compatriot in The Mirror. "But a striker is also dependable also on his team-mates more than any other position.
"For me, a striker is more than only a man who has to make goals.
"He has to be an attacking point, so we can play in the third and fourth phase of our attack.
"That is not only to make goals. He can also make assists or create the pass before the assist. That's how I judge players and especially strikers.