Alisson will prove to be a "big loss" for both Liverpool and Brazil while he recovers from a calf injury, according to Kleberson.
The 26-year-old was forced off the pitch midway through the first half of Liverpool's 4-1 opening day victory over Norwich on August 9, with no word yet on when he will return to the senior fold.
Reds' summer signing Adrian filled in for the Brazilian in subsequent wins over Chelsea and Southampton, in the UEFA Super Cup final and Premier League, respectively, with Jurgen Klopp likely to stick with the Spaniard over the next few weeks.