Sergio Ramos took part in training on Tuesday as the Real Madrid captain bids to be fit in time for El Clasico.
Defender Ramos withdrew from Spain's squad for their friendly against Romania after experiencing discomfort in his back during the draw with Italy last week, prompting fears he could miss Saturday's trip to Camp Nou.
The 29-year-old's availability for the clash with Barcelona remains unclear, but he was present for "the first part of Tuesday's session before continuing to work indoors", a Madrid statement confirmed.
Several of Madrid's international contingent also took part in the session after returning from duty with their countries, including Luka Modric, Isco and Mateo Kovacic.
Zinedine Zidane's team travel to Camp Nou in third place in La Liga, 10 points adrift of leaders Barca with just eight games left to play.