Manchester United right-back Diogo Dalot has heaped praised on countryman Diogo Costa.
The Red Devils are being linked with a move for Costa, who is a highly rated shot stopper at FC Porto.
With David De Gea and Dean Henderson both having uncertain futures, a first team keeper is a priority for United.
On Costa, Dalot stated, per Manchester Evening News: I grew up with him and he's my friend, there's a great relationship between us.
I know perfectly well that he has the capacity to one day be one of the best in the world.
I don't know if he'll be at Manchester United or another big club in Europe, but he shows at Porto that he is a big player and has helped the club a lot.
If he continues there, I'll be happy. If he leaves, I hope he has the greatest success at his next club."