The inclusion of youngster Chumi in Barca's first leg defeat could jeopardise their future in the competition, no matter how Thursday's game finishes
Levante president Quico Catalan has confirmed that his team will make an official complaint to the Spanish Football Federation (RFEF) over irregularities in Barcelona's Copa del Rey team last week.
The Valencia side caused a huge upset in the last 16 by downing Barcelona 2-1 in the first leg.
Erick Cabaco and Borja Mayoral struck in the first half for the hosts, while Philippe Coutinho pulled one back for his side with a late penalty to keep the tie hanging on a knife-edge.