Van Gaal has been under pressure since United were knocked out of the Champions League in the group stages
He looked set to be sacked during December when United went eight games without a win before finally beating Swansea on January 3.
Jose Mourinho was linked with the post after he was sacked by Chelsea, while Ryan Giggs has also been touted as a potential successor.
He is contracted for another 18 months but the Daily Mail report that he has lost control of the club's transfer activity having overseen a number of pricey flops and could be on his way in the summer.
Memphis Depay, Matteo Darmian and Morgan Schniederlin have all struggled this season after being brought in by Van Gaal.
And the Angel di Maria saga is another blot on the Dutchman's copy book.
Louis van Gaal could be sacked in the summer after losing control of the club's transfer activity
The Mail report that all of United's dealings are now going through Ed Woodward, the club's executive vice-chairman.
United's reluctance to appoint Mourinho in December had pointed to a belief that Van Gaal could get things right at the club.
However this latest development suggests a change will be made in the summer when other options may be available.
United have insisted they are not in the race for Pep Guardiola, who is Premier League bound, but moves for Diego Simeone, Mauricio Pochettino or Laurent Blanc have not been denied.