Ramos did not feature in his team's semi-final win over Al Jazira Club on Wednesday after struggling with a back problem.
While it had been thought that the centre-back would also miss Saturday's showpiece event, the Spaniard has revealed that he trained on Friday "with no problem".
"I am feeling much better after a calf problem and then [the] back issue that I had. But today I trained with no problem," Ramos told reporters.
Champions League holders Madrid will look to win the Club World Cup for a third time when they face Brazilian outfit Gremio in the United Arab Emirates.