Manchester United are watching River Plate midfielder Enzo Hernandez.
The 21-year old Argentine holding player has a buy-out clause that rises to £20.6million this summer and has also attracted interest from Real Madrid and Manchester City scouts.
United scouts saw him against Fortaleza in the Copa Libertadores on Wednesday when Hernandez scored in a 2-0 win.
United are looking to add two midfielders this summer with Nemanja Matic, Juan Mata and Jesse Lingard leaving while Paul Pogba is also out of contract.
They have also discussed potential moves for long time target Sergej Milinkovic-Savic at Lazio, Leeds' Kalvin Phillips and Monaco's Aurelio Tchouameni but much depends on their Champions League qualification and whether those targets are achievable with their subsequent budget.
Erik ten Hag, who verbally agreed a deal to become United's next manager earlier this week, will also want a say in signings when he takes over at Old Trafford.
The Dutchman has been offered a three-year deal with an option for a fourth after emerging as the preferred target among the United hierarchy.
The 52-year-old's appointment is not expected to be confirmed until after his current club Ajax play PSV Eindhoven in the final of the Dutch Cup on Sunday.
United look set to miss out on securing a place in the Champions League and could end up in the fledgling Europa Conference League if their results do not improve in the remaining seven games.