Liverpool secured the services of the talented Irish goalkeeper in the summer of 2015.
Caomhin, pronounced Quivine, was born in Cork and joined the Reds from Ringmahon Rangers.
Having progressed through the ranks at the club's Academy, Kelleher trains with the first team at Melwood.
He made three friendly appearances for the senior side in pre-season ahead of the 2018-19 campaign before signing a new contract and was on the bench for the FA Cup third-round tie at Wolverhampton Wanderers.
The shot-stopper collected a winner's medal after Liverpool beat Tottenham Hotspur in the 2019 Champions League final.
Kelleher received his first senior call-up to the Republic of Ireland national team in November 2018.