Firmino agreed a five-year deal with the Reds in April, while Salah was confirmed to be remaining with the club until at least 2023 on Monday morning.
The structure is in place for Liverpool’s key names to be rewarded for their progress, and as part of a devastating forward unit Mane is next in line for an extension.
The Mirror‘s David Maddock has elaborated further, claiming Mane has also been offered a new five-year deal.
Trent Alexander-Arnold has four years remaining on the deal he signed last summer, while Ben Woodburn also agreed a new five-year contract in October and Rhian Brewster is set to sign his first professional deal imminently.
Heading into the new season, the majority of Klopp’s squad will be aged 27 or under, with only Lovren, who turns 29 this month, and Jordan Henderson, 28, expected to play a key role of those older.
Klopp himself is committed to the club until 2022, when he is likely to depart for a new challenge, though the Reds will be hoping he remains beyond a seven-year spell.
He can build around the likes of Mane, Firmino and Salah, as one of the most exciting attacking lines in European football.
Mane was linked with a shock move to Real Madrid earlier this summer, though speculation was swiftly quashed, and Keita attested to his close friend’s affection for the club on his arrival.
The winger is not set to report back for pre-season training until later in July, following Senegal’s exit at the group stage of the World Cup.