Manchester United are ready to run the rule over Celtic’s Kieran Tierney again at Sunday’s Old Firm derby as Jose Mourinho formalises his summer transfer plans.

According to Dailymail Mourinho’s trip to Hampden Park last month, when he observed Scotland’s 1-0 loss by Costa Rica, had originally been scheduled as a scouting mission.

United scouts had recommended Tierney and Mourinho was hoping to check on the defender until the 20-year-old withdrew from the squad.

Man United ace Scott McTominay played in that friendly, however Mourinho’s travel arrangements were settled before the 21-year-old had pledged loyalty to Scotland.

Mourinho caught up with ex Scotland manager Craig Brown, to whom he became close while studying for his UEFA Pro Licence north of the border, and asked about Tierney’s improvement.

Man United are expected to have an official at Hampden Park on Sunday when Celtic play against Rangers in the Scottish Cup semi-finals.

Mourinho has made it no secret to executive vice-chairman Ed Woodward that a new defender should be seen as a preference given persistent difficulties with Luke Shaw.