Fiorentina beat Udinese mid-week
Marcos played a full 90 minutes at centre-half on Wednesday night as part of a back three.
His Fiorentina side beat Udinese 3-0 at home to leave the Viola in tenth place and just three points from third place. A brace from Khouma Babacar and a late Borja Valero strike gave the side a good victory in front of their home crowd.
Fiorentina now face Sampdoria on Sunday as the look to build on the result.