The 20-times English champions are still to receive an offer from Boca on Rojo, but initial discussions have taken place.
The defender was on loan at Estudiantes last term and is open to returning to Argentina in spite of interest from Sheffield United and Newcastle United.
Marcos, who has been sidelined since last year’s October with a calf injury, has made 122 appearances for his side during an injury-ravaged six-and-a-half years at Old Trafford.
Rojo did oversee some trophy success at UNited though, helping Louis van Gaal win the FA Cup four years ago before being part of the EFL Cup and Europa League-winning double side under then-manager Jose Mourinho.
A move to Boca Juniors would see Marcos reunited with former international team-mate Carlos Tevez, who infamously crossed the city divide after two seasons under Sir Alex Ferguson to sign for Manchester City back in 2009.
Manchester United centre-back Marcos Rojo has held negotiations over a move to Boca Juniors in his native Argentina, though a reported deal has still to be finalised.
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