Premier League clubs are tracking Celtic striker Odsonne Edouard.
The Daily Record says Edouard has netted 21 times in the league this term - eight more than his closest challenger Jermaine Defoe.
Celtic have opened up a 12-point gap at the top of the table as they hunt a ninth straight title.
United are desperate for attacking reinforcements this summer after missing out on Erling Braut Haaland last month.
Everton and Newcastle will also be looking to bolster their ranks when the window reopens.