The influential 31-year-old midfielder picked up a calf injury in his right leg two weeks ago and has missed the side's last three matches, including the second leg of the semi-final against Werder Bremen.
Uruguayan striker Walter Pandiani, the UEFA Cup's leading scorer with 11 goals, continued training apart from the rest of the squad. Pandiani is recovering from a knee injury picked up last Sunday, though it is not believed to be serious.
Luiz Suarez wins hot-tempered derby to relegate Espanyol after Fati and Lozano see red
Espanyol visit title-chasing Real Madrid in the Primera Liga on Saturday before turning their attentions to Wednesday's final in Glasgow.
Karim Benzema's moment of magic sends Real Madrid two points clear of Barcelona
Ten-man Espanyol cling on for goalless draw at Getafe, Villarreal beat lowly Mallorca