Manchester United are lining up a move for Benfica’s Alex Grimaldo, according to reports.
The Daily Mail claims club scouts watched the former Barcelona left-back against Feirense on Sunday night and watched him score in a 4-0 win.
Representatives for Middlesbrough, Valencia and Juventus were also in Lisbon on Sunday, the paper says.
The Spanish youth international has a huge £51million buy-out clause in his contract but his prospective suitors believe Benfica could be open to a more-reasonable transfer fee.
Grimaldo only joined Benfica in a £1.25m deal from Barcelona in January and the Spanish champions hold the rights to a percentage any future transfer fee.
The left back, who can also play in a more-advanced role, has impressed in Portugal’s Primeira Liga to attract the attention of Europe’s top clubs.
Last month City manager Pep Guardiola had been to Lisbon with his brother Pere to watch Grimaldo having seen him rise through the ranks during his time as Barca boss.