Van Gaal took over after David Moyes was sacked for guiding United to 7th in the Premier League but the Dutchman has won three of his four games in charge since the transfer deadline with a completely new-look side.
After a difficult start which saw United lose at home to Swansea, draw at Burnley and Sunderland and suffer humiliation at MK Dons in the League Cup, Ferguson insists Van Gaal will flourish once he has settled into the job.
Speaking to MUTV, Ferguson said: “He’s not been getting the results that are expected, but when I came to the club I didn’t get the results I expected myself at the beginning,” said Ferguson on Manchester United’s TV channel.
“What we needed then was Sir Bobby Charlton, Martin Edwards (chairman) and the board to stick by me and we had a great spell after that.
“Once I got settled into the club, everything was fine. Louis is going through that same process and there’s no doubt in my mind he will sort it out.”
Last weekend’s victory over a stubborn Everton side saw United climb into the top four for the first time in over a year, a remarkable stat for a club that has been a permanent fixture at the top of the league since the inception of the Premier League back in 1992.
To put a stop to United’s slump, Van Gaal spent over £150m on new players over the summer and Ferguson has backed the manager’s boldness in the transfer window.
He added: “When you can identify ability like that needed by Manchester United, they have the resources to do that. They are fees I never quite equalled but, nonetheless, they were needing quite a big injection this year,” added Ferguson.
“They brought in some good quality. It was really important because you need quality at Manchester United, you need the best players.”
Van Gaal brought in Ander Herrera, Luke Shaw, Marcos Rojo, Daley Blind, Angel Di Maria and Radamel Falcao but didn’t reap the rewards until after the first international break. Herrera picked up an injury in the opening game, Shaw was injured during pre-season, Rojo had lengthy work permit issues whilst Blind and Falcao didn’t sign until deadline day.
Now that his squad are starting to settle, there is a palpable feeling that United are only going to keep improving from here on in.