Celtic midfielder Victor Wanyama has refused to rule out summer move, putting the likes of Arsenal and Manchester United on alert.
United were linked with Wanyama last summer, and scout Martin Ferguson - the brother of Sir Alex - is believed to have watched the Kenya international several times this season already.
Arsenal are also keen on signing the powerful midfielder and scouts were in attendance during Celtic's recent Champions League last-16 first-leg defeat at home to Juventus.
Wanyama last month pledged his future to Celtic - at least until the end of the season - and reflecting on Wednesday night's defeat away to Juve in the second leg of the European tie has admitted he may not be at the club next season.
The 21-year-old believes Celtic can go further in the Champions League next season, and told the Daily Mail: "I always believed we could get this far in the Champions League, even though many other people did not.
"We have become a better team the longer it has gone and we can be better again next season."
But Wanyama hinted at a possible summer exit from Parkhead, adding: "What I don’t know is whether we will all be together next season. I hope so, but no one knows yet.
"I believe if we stay together, we can get better. We just have to wait and see."
Celtic are reportedly prepared to part company with the player should they receive a bid in the region of £10million.