Former Scotland international Pat Nevin has urged Manchester United to make a move for Kieran Tierney.
The 20-year-old is one of the most interesting young defenders in Europe with Nevin describing him as the "best left back in Scotland".
The left back area has been a huge problem for manager Jose Mourinho this season and the Portuguese might decide to add new elements to strengthen his defensive department.
"At the moment, one of the best left backs around, I think we'll all agree, is Andrew Robertson," Nevin told BBC Radio 5 Live's Football Daily.
"He's playing at Liverpool now with a Champions League final [looming] and he's had an absolutely stunning season.
"But he's the second best left back in Scotland.
"Manchester United might think about looking up and trying to get the best left back in Scotland.
"Celtic fans won't thank me for it but there is a better one up there and he would walk into any Premier League team.
"And it's Kieran Tierney."
