There is now "significant interest" in Kieran Tierney as the Arsenal star faces a major career call this summer. The former Celtic favourite has lost his spot in Mikel Arteta's starting XI to Oleksandr Zinchenko and despite the Gunners being keen to keep him at the Emirates, a move away may be his best chance of getting more game time - especially with the Euros potentially looming in 12 months' time.
Newcastle have been long-term admirers and Eddie Howe is in the market for a left back, but FFP constraints may scupper a Toon bid as they remain careful not to spend too much this window.
And then of course there is the possibility of a romantic homecoming to Celtic. A loan move would likely be the most realistic way of the Premiership champions doing a deal for Tierney.
He is reportedly willing to take a significant pay cut to make a switch back to Parkhead happen, but it would still be an expensive deal for the Hoops to do.