Alisson’s arrival on Merseyside was confirmed on Thursday for a world-record fee for a goalkeeper that could rise to £65million.
The 25-year-old shared a dressing room with Salah at the Stadio Olimpico during the 2016-17 campaign before the Egypt international departed for Liverpool, where he was a revelation last season.
And Alisson says Salah made contact when speculation grew over a potential move.
“Yesterday, he sent me a message saying: ‘Hey, what are you waiting for?’ As the negotiations were at an advanced stage, I replied to him straight away saying: ‘Calm down, I’m on my way!’
“To be with these great people and players day to day is fantastic for me.”