Back in the summer of 2018, the club signed the Brazil international from Roma for a transfer fee of €62.50 million.
Since then, Alisson has kept 77 clean sheets in 165 appearances for Liverpool's first-team.
As quoted by Anfield Watch's Twitter account, the Englishman told BT Sport the following: "Massively [important player]. I think as a signing, he's one of the best signings the club has probably done in a long, long time. He's incredible.
“You feel so safe with him behind you, he can pull off out of this world saves, he's so comfortable and calm when he's playing out from the back and it just makes a huge difference to the whole team."
Jordan Henderson on Alisson:
Anfield Watch Verdict
As we have already pointed out, Alisson has been a superb player for Liverpool. The shot-stopper is having a solid season.
Alisson has been averaging a WhoScored player rating of 6.81 across the 2021-22 club campaign.
The exciting thing about the Brazilian is that he is only 29 years of age. With that being the case, his career is far from over.
The club offered Alisson a new deal back in August 2021, which he accepted. The goalkeeper's contract does not expire until the summer of 2027, which further highlights that he will be Liverpool's first-choice goalkeeper in the years to come.
After signing the deal, Alisson made it clear that he's happy representing the Reds, which was nice to hear.
As quoted by Sky Sports, he told the club's official website the following: "Really happy. I'm really glad that I can keep going on with my work here, doing a good job here. So, I'm really happy to make this decision [contract extension] - that is not hard for me."
Alisson is clearly not taking his time at Anfield for granted.