Southampton manager Ronald Koeman has told Manchester United they will need to improve on their initial offer for Morgan Schneiderlin if they want to sign the French midfielder this summer.

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Koeman confirmed the Saints had received a bid from Old Trafford for Schneiderlin, who was absent from the club’s first training session of the new season on Monday, but said “it wasn’t serious”.

The Dutchman also said Southampton were hopeful of retaining Toby Alderweireld despite revealing Atletico Madrid, the defender’s parent club, are resisting their move to make his loan deal a permanent one.

“Morgan was ill but he is coming to training tomorrow and he will travel with the rest of the squad to Austria,” said Koeman ahead of Southampton’s pre-season trip.

“He was not feeling well, so he had contact with the doctor and he stayed at home. Two weeks ago we had a big offer from Man United but it wasn’t enough. It wasn’t serious and no more bids today.

“If there is any business then I hope it will be soon because it is best for the player, best for us and we have to think about ourselves if we sell the player.”

While Koeman faces up to the prospect of losing Schneiderlin he could also be without the services of Alderweireld this season.

“Southampton signed an option for the player and Atletico Madrid is trying to take back the option,” said Koeman. “In our knowledge this was too late and what happened with Spurs in the middle, I don’t know.”