Both players were given extra time off following their World Cup involvement with their respective countries, but returned to Melwood on Friday ahead of the club's US tour.
The pair will fly out to the States with the rest of the squad on Saturday as Liverpool intensify their preparations for the new Premier League season.
Salah and Mane will be under pressure to produce this term as Liverpool go into the campaign as one of the favourites for the title affter a summer of heavy spending.
Alisson, Fabinho, Naby Keita and Xherdan Shaqiri have all been added to a squad which already reached the Champions League final last season, leaving many onlookers to pick the Merseysiders out at the biggest threat to Manchester City.
Trent Alexander-Arnold, Jordan Henderson, Dejan Lovren and Simon Mignolet all remain on holiday.
Menawhile, Mane has been handed the number 10 shirt this season. The shirt has been vacant since Philippe Coutinho's move to Barcelona.