Manchester United will scout Scotland international Kieran Tierney extensively next season before launching a bid to sign the 21-year-old defender in 2019, according to reports.
Head coach José Mourinho is known to be a long-term admirer of the Celtic left back, who can also play on the right-hand side of a back four.
United have been linked with moves for Tierney throughout the Portuguese manager's reign at Old Trafford, although the club have so far delayed talks for the defender.
But that will change next season, according to the Manchester Evening News, who claim that scouts will travel to Celtic Park throughout next season before meeting the Scottish club's valuation of the player - believed to be in excess of £25m.