Bhattacharja who featured for SC East Bengal in ISL 2021-22 is keen to better his performance in goal in the upcoming campaign having won the ISL Golden Glove award in ISL 2020-21 campaign.
Diagne's most recent stint was with Albanian outfit KF Vllaznia where he played under Chennaiyin's new boss Thomas Brdaric. He won the Albanian cup in 2021-22.
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.
Having spent a chunk of his footballing career with several Kolkata-based clubs, Das has found a new challenge in Bengaluru FC and aims to strengthen his game in new colours.
The 25-year-old, who joined the club as part of its residential academy in 2017, made his first-team debut in February 2019, before being named BFC B Player of the season later that year
Before joining the Juggernauts, the 29-years-old full-back played for ATK FC in ISL 2019-20 season and he saw the heavyweights from Kolkata lifting the championship.
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.