Southampton manager shares the details of his fractious relationship with his former Barcelona colleague.
The pair famously fell out at Ajax when Koeman was manager and Van Gaal was the technical director. It seems that the pair have failed to repair their relationship since.
That has led Koeman to admitting it would be “special” if he were to beat his United counterpart when the two sides meet this weekend.
“We had some problems in the past. We shake hands and I hope he will do well with United. It would be special to beat him, but I lost the last time and we try to put it right this time,” said Koeman.
The Southampton manager has also claimed that United should be challenging for the title considering how much money they spent during the summer transfer window, and Van Gaal has no excuses if they fail to do so.
“They have great players so it's normal that they will fight for titles. They have to. How you can spend that money, how can you sign that kind of players, and not be fighting to win titles?” added the Dutchman.
“Everything is up to Manchester United. They have a very successful coach, they have great players, they have money, they have great fans, a great stadium. It's normal that you win titles.”
United are currently third in the table, nine points behind leaders Chelsea and Manchester City, and face Southampton looking to close that gap. However, Van Gaal has twice played down any hopes of his side winning the title this year.
The match at Old Trafford could see Southampton leap-frogging their opponents into third place in the Premier League with a win, as Koeman’s first season in England has been a successful one so far.
“I believe we belong in the top four. I hope the players show that as well," said Koeman.
“We didn't have that kind of result before the United game last time. We lost because of our mistakes and the individual qualities of their players. That's the difference. We can beat them. I believe we can make it very difficult for them.”