Sergio Ramos could reportedly seek a move away from Real Madrid this summer.
Ramos has been with Los Blancos since 2005, making more than 600 appearances in all competitions for the reigning European champions.
The 33-year-old missed the latter stages of the 2018-19 campaign with a calf problem although he is expected to be available for Spain's fixtures against Faroe Islands and Sweden next month.
Spanish sources have claimed that Ramos is still unhappy with how club president Florentino Perez dealt with the defeat to Ajax in the Champions League, and Madrid would listen to a big offer for their captain this summer.
Ramos, who was strongly linked with a move to United in 2015 before penning a new deal, will see his current contract expire at the end of the 2020-21 campaign.
The 163-time Spain international has won four La Liga titles, two Copa del Rey trophies and four Champions League crowns during his time in the capital.