Januzaj was once Manchester United's hottest prospect after bursting onto the Premier League scene in the 2013/14 campaign under David Moyes.

But the 22-year-old winger has since failed to live up to his potential and is said to be surplus to Jose Mourinho's requirements this summer.

Januzaj flopped out on loan at Borussia Dortmund last season and again struggled for form at relegated Sunderland this year.

And bookmakers Betfair have priced Scottish champions Celtic as joint 3/1 favourites - along with La Liga outfit Real Sociedad - to sign Januzaj.