Jesse Lingard and Juan Mata have been selected in wide roles in recent weeks, with the young English winger netting his first Premier League goal in the 2-0 in over West Brom on Saturday, but Van Gaal wants something different.
Memphis Depay has been largely disappointing since signing from PSV Eindhoven, failing to cement a place in the first team and paving the way for the emergence of Lingard.
And the Manchester United manager has suggested that bringing in pace on the wings is one of his main priorities.
"I have said already in my first year many times we need speed and creativity on the wings," the Dutch coach said after the win over West Brom.
“You have seen that now we play with Jesse Lingard and he is not the most speedy winger in the world and Mata is also not the most speedy winger in the world.
"So first we must first finish that problem and then we can see how we have to play and how we are in balance with playing with speedy wingers."
United were linked with Southampton forward Sadio Mane in the previous transfer window and have been continually touted as a possible destination for Neymar, with the Barcelona winger confirming that the Old Trafford club approached his representatives prior to the start of the season.
But Van Gaal indicated that any possible transfers would be restricted by who is available.
"It is also dependable on what I can buy. I want to buy a lot of players but not all the players I want are for sale. So there are a lot of factors in it.
"It is dependable for instance on the rehabilitation of Luke Shaw – how long it will last."