The 29-year-old missed Wednesday's Copa del Rey final victory over Barcelona with a knee injury but is on course to make a swift recovery
The 29-year-old missed Wednesday's Copa del Rey final win over Barcelona with a knee injury and looked set to be absent for the first-leg of his side's last four European tie on Wednesday.
However, he could now be available for the clash with Pep Guardiola's side after coming through the first part of Sunday's training session.
Madrid boss Carlo Ancelotti will also be encouraged by the participation of Marcelo, who emerged unscathed from the practice having been sidelined with a hamstring problem.
Copa del Rey hero Gareth Bale was also present following his match-winning heroics in midweek, while defender Sergio Ramos worked alone inside the club's training facility.