He was being scouted by a lot of teams, but that doesn't mean they were going to make an offer. Most were probably just doing due diligence like they would with a lot of young prospects.
TBF I think the only reason he is playing is that Robins thinks he is the best man for the job. Don't think there was ever any ulterior motive. The fact premier league teams are looking at him suggests Robins is probably right.
Have you heard/seen something or are you just having a guess? If McCallum goes, it wouldn't surprise me if we brought someone else in even if it's just a loan.