Celtic full back Kieran Tierney is being scouted by Manchester United.

The Mirror says United boss Jose Mourinho has made a left back a priority in this summer's transfer window and has had glowing reports on 20-year-old Tierney.

They have also looked at Tottenham's Danny Rose and Juventus star Alex Sandro but Tierney would cost a fraction and is seen as one of Britain's most promising youngsters.

Tierney, who last signed a contract last year, can play in both full back roles and also operate as a centre half or in a back three.

United believe they may be able to get him for around £10m.