Liverpool signing Marko Grujic will wear the No16 shirt for his new club. Grujic, 20, officially signed for the Reds from Partizan Belgrade during the January transfer window but remained at the Serbian club for the duration of the 2015-16 season.
Liverpool were also waiting for the midfielder to be awarded a work permit allowing him to play in the UK. On Monday (6 July), the club confirmed the highly-rated youngster is now eligible to play for his new club having secured the required paper work, also confirming his squad number.
Grujic will join fellow new signings Sadio Mane, Loris Karius and Joel Matip when Jurgen Klopp's side return to training this week.
Mane became the fifth player to leave Southampton for Liverpool in the last two years, following Adam Lallana, Rickie Lambert, Nathaniel Clyne and Dejan Lovren after completing his move to Merseyside at the end of June.
According to BBC Sport, Liverpool will pay an initial fee of £34m ($45m) for the Senegal forward. That could rise to £36m, however, which would make Mane the club's record signing, eclipsing the £35m paid for Andy Carroll in 2011.
The 22-year-old goalkeeper Karius became Liverpool's second signing of the summer in May after the club agreed a fee with Bundesliga outfit Mainz. He will arrive alongside Cameroon defender Matip, who agreed terms with the Reds in February.
Matip joins Liverpool after being an ever-present figure in the Schalke first-team last season and is expected to immediately have a role to play in Klopp's first-team next season.
"I am ready for it [English football] but I also have work to do on my body," he told the Liverpool official website. "This is another league, so I will have to work on my body to play here and to be physically strong [enough] for the Premier League."