United could sign Madrid star in January.
Manchester United may be on alert for the possible signing of Real Madrid left-back Marcelo this January, according to Spanish source Fichajes.net.
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The Brazil international is possibly set to be replaced at the Bernabeu by Bayern Munich youngster David Alaba, with the Austrian becoming a top target for Real.
United are keeping an eye out for new additions at left-back after losing Patrice Evra to Juventus in the summer, with only Luke Shaw available in the left-back position at the moment.
Marcelo has long been a key player for the Spanish giants, and would no doubt make a great signing at Old Trafford, joining former team-mate Angel Di Maria if he makes the move.