Southampton boss Ronald Koeman has revealed that he has major issues with Manchester United boss Louis van Gaal, reports the Express.
The pair - who worked with each other at Ajax when Van Gaal was technical director at the club, while Koeman managed the side - seemingly had a number of problems at the Dutch club.
It appears, then, that the duo's relationship crumbled for a number of reasons - on and off the field.
"We had some problems in the relation between his job and my job," said Koeman talking to the Independant.
"First he left Ajax and, after three and a half years I left, too. It was difficult because it was a problem in the relation in football.
"But you know, if there is a problem in football relations then there is also a problem outside of football.
"Never more was there the contact that we had before. Sometimes a little bit fighting [dispute] between each other."
The duo will come up against each other in the Premier League for the first time in December when the Saints play host to the Red Devils at the St Mary's.
For now, though, both managers will be in great spirits after their club's secured victory earlier today. Manchester United just about overcame West Ham with a 2-1 win thanks to goals from Wayne Rooney and Robin van Persie. Rooney was, however, sent-off with a third of the game remaining, meaning it was a nervy final period for the Red Devils.
Southampton also secured a 2-1 win on home soil against strugglers QPR. Ryan Bertrand and Pelle were on target for Koemans's side to keep them in second place in England's elite division.