The world record signing has missed Real's last two matches with the problem after pulling up in the warm-up ahead of the 4-1 victory over Getafe, but he returned to training on Thursday.
Bale rejoins a squad that will be full of confidence following their controversial victory over Elche on Wednesday, although they will likely still have the words of coach Carlo Ancelotti ringing in their ears.
Ancelotti's side needed a highly debatable last-gasp penalty from Cristiano Ronaldo to secure the points with the last kick of the game in midweek, and the Italian admitted that his players must do more if they are to overcome their arch-rivals at the Bernabeu this weekend.
"Playing the way we did (against Elche), we are not going to win the derby," he said. "We need to play better, with more intensity and more personality."
They won their last meeting with Real in extra time in last season's Copa del Rey final but they have not tasted league success against their capital counterparts since 1999.
"We have a great team," he said. "We know how to beat them.
"As a player you never play to draw, always to win."
