Should a move end up materialising, however, the 30-year-old will become the seventh player to transfer between the two clubs since the turn of the millennium.
In the 2000s, David Beckham, Ruud van Nistelrooy, Gabriel Heinze and Cristiano Ronaldo all left Manchester for Madrid.
United landed Angel Di Maria from the La Liga titans back in the summer transfer window of 2014, shortly after the appointment of Louis van Gaal as manager.
Javier Hernandez left Old Trafford for the Bernabeu on loan in 2014, having been seemed surplus to requirements by Van Gaal.
Despite not always being a regular in the side, he still managed an impressive 18 goal involvements from 33 matches for Real.
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