Van Gaal has played down talk of a rift with Southampton boss Ronald Koeman before the Dutch pair face each other for the first time in the Premier League.
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Van Gaal employed Koeman as his assistant at Barcelona from 1998 to 2000 and they combined to lead the Catalan club to the Spanish league title.
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Their next working relationship wasn’t so happy, though, when Van Gaal was appointed director of coaching at Ajax where Koeman had also become a title-winning manager.
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Following a number of disagreements, Van Gaal left 12 months later in 2005, to take charge at AZ Alkmaar and they have swapped barbs since.
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With Koeman now manager of Southampton, the pair are preparing to lock horns at St Mary’s Stadium tomorrow as they compete for a top-four place in the Premier League.
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But Van Gaal refused to fan the flames of the dispute and praised the work his compatriot has done since taking over in the close season and surprising many by leading the Saints into the race for Champions League places.
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“I don’t have to describe my relationship with the trainer of the opponent,” said Van Gaal.
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“That’s more private I think. We play against Southampton and we have to speak about Southampton and not the coach.
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“It’s the same in every country. Every country always has a surprise at the beginning of the season.
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“Zwolle — a club in the Netherlands — was leading the competition in the Dutch league for six or eight matches. It’s always like that.
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“But as I have said earlier, what always matters is the end of May. That counts. Now it’s not so important.
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“Southampton have a very good squad. I know a lot of players and a lot of players were offered to us.
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“They are able to come in the first four, but that’s also because I believe in the management of Ronald Koeman and his brother (Erwin). When the cohesion is good he can manage.”
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Southampton’s impressive start to the season came despite the sale of a number of high-profile players, including Luke Shaw to United and the trio of Adam Lallana, Dejan Lovren and Rickie Lambert to Liverpool.
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