“My information is that there are enquiries from Liverpool, United and Arsenal as to how much it would cost to sign him.”
However, Brighton are not in a position where they need to sell and are hoping to extend Bissouma’s contract.
Castles added: “I think with Bissouma, it’s become a bit more complicated for the clubs bidding for him because Brighton are cash rich at the moment after the sale of Ben White and they do not need to take the money in order to reinvest it in the areas which they are targeting, which are centre-forward and left-back.
“I understand they’ve opened discussions with Bissouma about improving his salary and extending his contract with the idea of retaining him for at least one more season.”
Speaking recently, United boss Solskjaer said he wasn’t expecting much business before next Tuesday’s deadline.