
The French superstar did not train with his teammates yesterday ahead of the game but coach Carlo Ancelotti said the striker would travel to San Sebastian.
Mbappe is Real’s leading goal scorer with 28 goals in 39 matches across all competitions this season.
Midfielder Fede Valverde and goalkeeper Thibaut Courtois were also left out of the travelling group to recover from minor fitness issues.
England international Jude Bellingham returned to the squad after missing Sunday’s La Liga win against Girona through suspension.
Yesterday Barcelona and Atletico Madrid played out a thrilling 4-4 draw in the first leg of the other semifinal.