Van Gaal will take up duties with United after the World Cup in Brazil, where he has impressed in taking Holland to the semi-finals.
Scholes wrote in his Paddy Power Blog: "Right now, Manchester United fans (and myself) cannot wait for Louis van Gaal to get the job started at Old Trafford.
"It's not a vintage Holland team he's managing and van Gaal has got them to the brink of a World Cup final.
"He's going to have to perform a similar operation at United after a shocking season in 2013-2014.
"Van Gaal seems to have the Midas touch, and with his coaching reputation and vast experience he can bring a lot to the club.
"He'll improve last year's performance by 20-25 per cent, I feel.
"As well as the new signings, Luke Shaw and Ander Herrera, (and hopefully more to come) he'll bring more out of the players who are already there. I'm actually really excited about next season."
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