Rizwan and Irfan both suffered hamstring injuries in the third match in Rawalpindi
A statement from the federation said head of the competition Carmen Perez had rejected Levante's complaint against Barca for fielding defender Juan ‘Chumi’ Brandariz in the game when he was supposed to be serving a suspension because it arrived after the 48-hour deadline.
Barca, who have won the last four editions of the Copa del Rey and have lifted the trophy a record 30 times, won Thursday's second leg 3-0 at the Nou Camp for a 4-2 aggregate win, and will take their place in the quarter-final draw later on Friday.