Manchester United will be without Alejandro Garnacho for the FA Cup final.
The Red Devils are set to take on Manchester City in the showpiece event at Wembley in early June.
However, Garnacho wants to play for his country in the FIFA Under-20 World Cup.
Per Argentine reports, Garnacho has stated he will join up with Javier Mascherano's squad.
He will also miss the last one or two games of the Premier League season.
Garnacho is presently out of action with an ankle injury that he sustained against Southampton.