De Gea has spent a decade with the Red Devils but his form has been scrutinised in recent years.
A swap involving Atletico Madrid goalkeeper Jan Oblak could solve United's problems.
Manchester United are lining up a swap deal involving star goalkeeper David de Gea and Atletico Madrid's Jan Oblak, according to The Sun.
De Gea's future has been uncertain since Dean Henderson signed a long-term contract extension at United, who remain uncertain about the pair.
Spain international De Gea joined United from Atletico in 2011 and the Red Devils are prepared to offer the LaLiga giants a reunion in exchange for star Oblak.