Petratos who played for Australia at the 2018 FIFA World Cup will join the Mariners ahead of the new season and will bring in loads of experience having played in countries like Australia, Saudi Arabia, South Korea, and Malaysia.
Krishna, who captains Fiji and has the most goals and appearances for his country, has previously turned out for ATK FC and ATK Mohun Bagan in the Indian Super League (ISL)
Pogba comes with a wealth of experience of playing elite-level football in Europa having appeared over 140 times in Ligue 2, the second-tier of French football while also featuring in Ligue 1 on 66 occasions in his career.
The Mariners will be in action in the latter stages of the AFC Cup, the Durand Cup, the ISL and possibly even the Super Cup and Ferrando wants to win it all.
The 29-year-old remains a key part of Juan Ferrando's plans at the club and is certain to play a vital role not just in the Hero ISL but also in the Mariners' AFC Cup campaign.
The winger joined the Mariners ahead of the Indian Super League (ISL) 2022-23 season and is looking to join up with Indian teammates Liston Colaco and Manvir Singh in what could be an all-Indian attacking line-up at ATK Mohun Bagan.
Raynier Fernandes began his football career with Air India before representing Maharashtra in the Santosh Trophy. His breakthrough season came in 2017-18 with Mohun Bagan AC.
Florentin who is the brother of France World Cup winner and former Manchester United midfielder Paul Pogba will further strengthen the Mariners' defence which was bolstered by the addition of Australian defender Brendan Hamill on Thursday.
The Sydney-born, 29-year-old defender started his career by playing in youth academies and lower division clubs in Australia and made his professional debut at Melbourne Heart FC (now rebranded as Melbourne City FC) in 2010.