The future of David De Gea at Manchester United is likely to hinge on whether he starts for Spain at Euro 2016.

De Gea's supreme United form has led to calls in Spain for him to start, but Vicente Del Bosque has remained loyal to Porto's Iker Casillas.

Real Madrid has long been interested in signing De Gea, whose girlfriend prefers to live in Spain.

United believes De Gea earning the preferred choice status will prove to him he doesn't need to leave the club for Spain.

Real Madrid agreed to a deal for De Gea but a paperwork issue broke the transfer up.