Liverpool are yet to put a time frame on Alisson's return from a calf issue suffered against Norwich City.
Jurgen Klopp confirmed Naby Keita is struggling with a hip problem and does not know when the midfielder will return.
Liverpool have conducted a quiet transfer window and Jurgen Klopp was not willing to make noise about Philippe Coutinho.
The returns of Mohamed Salah, Alisson and Roberto Firmino will give Liverpool a welcome boost, according to Andy Robertson.
The injury Naby Keita aggravated at the African Cup of Nations appears unlikely to impact his availability for Liverpool in August.
After helping Guinea secure a last-16 place at the Africa Cup of Nations, injured Naby Keita has returned to Liverpool for assessment.
Naby Keita was replaced with 20 minutes to go in Guinea's defeat to Nigeria but said he is "fine" and could feature against Burundi.
Naby Keita failed to spark Guinea's Africa Cup of Nations campaign into life as Kenneth Omeruo's goal sent Nigeria into the last 16.
Guinea coach Paul Put expects Naby Keita to be involved in Sunday's friendly against Egypt ahead of the Africa Cup of Nations.
Liverpool manager Jurgen Klopp has named his 23-man squad for Saturday's Champions League final against Tottenham.