Adrian has joined Liverpool to replace Simon Mignolet, who left for Club Brugge in a reported £6.4million deal.
Simon Mignolet has ended a six-year stay at Liverpool, signing with Club Brugge.
Harvey Elliott made his Liverpool debut in a 3-0 friendly defeat to Napoli after joining the club from Fulham.
Liverpool played out a draw against Sporting CP in a pre-season friendly at Yankee Stadium.
Alisson started all 38 Premier League matches last season but Liverpool manager Jurgen Klopp still wants Simon Mignolet to stay at Anfield.
Belgium boss Roberto Martinez has called up Vincent Kompany for the Red Devils' matches against Kazakhstan and Scotland.
Alisson's arrival for a world-record fee has restricted the Simon Mignolet's opportunities, leaving the Liverpool goalkeeper frustrated.
Liverpool have the chance to respond to their first Premier League defeat of the season when they take on Wolves in the FA Cup on Monday.
Alisson has consigned Simon Mignolet to the sidelines for Liverpool this season but the Belgian will start the EFL Cup clash with Chelsea.
Simon Mignolet has aired his frustration at not being allowed to leave Liverpool, with Jurgen Klopp unimpressed with the Belgium goalkeeper.