The trio, who were afforded additional time off following their participation at the World Cup, returned to Liverpool's training ground for physical testing before joining their teammates on the Reds' tour of the United States.
Jürgen Klopp and his players will fly out to America on Saturday for International Champions Cup matches against Borussia Dortmund, Manchester City and Manchester United - all of which will be shown live on LFCTV and LFCTV GO (restrictions apply).
Take a look at a gallery of Salah, Mane - Liverpool's new No.10 - and Grujic's first day back at Melwood below...
Photos by John Powell