According to MailOnline's Simon Jones, Leverkusen are eager to increase competition in their squad and believe Rojo may be available given that he was deemed by United "surplus to requirements at the start of the season."
Jones also noted that Red Devils manager Jose Mourinho is eager to add a new centre-back in January and selling Rojo could free up space, but United are keen to recoup as much as possible of the £16 million they paid Sporting CP for the Argentinian in 2014.
Not so long ago, the 26-year-old's Old Trafford career looked all but over as he was poor in his sporadic appearances at the start of the season.