The 29-year-old is returning to his homeland after being frozen out at Old Trafford.
He wants playing time to ensure he is part of Argentina's squad for Copa America.
Estudiantes announced that agreement had been reached with United on their social media channels, saying: “You always return to the places where you were happy. Because of the sense of belonging, it's stronger.
“Your dream and that of the Pincha family come true. We meet again. Welcome and thanks for coming back, Marcos. We welcome you with our hearts."
Uno vuelve siempre a los sitios donde fue feliz. Porque el sentido de pertenencia es más fuerte. Tu sueño y el de la Familia Pincha se hacen realidad Nos reencontramos en UNO
Bienvenido y gracias por volver, Marcos! ¡Te recibimos con el corazón! pic.twitter.com/rAzQrSlnzX
— Estudiantes de La Plata (@EdelpOficial) January 30, 2020
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