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The Dutchman is desperate to continue his Old Trafford revolution this summer having returned United to the Champions League during his first season in charge.

The former Holland boss spent over £150m on new players last summer and will be backed in the transfer market again this summer, with some reports suggesting as much as £250m could be spent.

United have already announced the £25m signing of PSV Eindhoven star Memphis Depay.

But Van Gaal says he needs to ensure he has at least two players in every position if United are to return to the summit of English football next season.

"The board of Manchester United shall say now we have to battle for the championship," Van Gaal told MUTV.

"I think it's a fantastic challenge but it is also dependable on how we can purchase good players and how we can improve the balance in our squad.

"When you see against Arsenal what I had to do, I had to put players in positions that they never play.

"That's a pity because the balance in our selection was not good. You need two players for every position.

"But the board brought me here to win titles. I want to win titles for the fans but also for myself.

"The biggest challenge is what your ambition is, and my ambition is to win titles.

"It is not easy, everybody knows that and we shall fight till the end and I will give everything in me to build a team as champions."

The likes of Nathaniel Clyne, Dani Alves, Nicolas Otamendi, Ilkay Gundogan, Diego Godin, Gareth Bale, Nicolas Gaitan, Karim Benzema and Edinson Cavani have all been linked with moves to Old Trafford.

United finished fourth this season, a mammoth 17 points behind champions Chelsea while they were nine points and five points behind Manchester City and Arsenal respectively.