The youngster, who becomes the first Hyderabad-based player to sign on professional terms with HFC, started off with Senrab FC (London) in 2014.
The 33-year-old centre-back has made 14 appearances for the Indian national team and his experience will be handy for the Kolakata- based side.
The youngster joins Hyderabad as the fourth new overseas player after Bartholomew Ogbeche, Edu Garcia and Juanan.
The 23-year-old has been a part of Hyderabad FC since its inception and spent the last season on loan with Real Kashmir.
Pritam becomes the ninth new arrival at Hyderabad FC this season, and the sixth domestic player to join the club.
Slavko played a pivotal role in Buducnost Podgorica’s fourth Montenegrin League title in 2019-20 and also featured in their Europa League qualifying matches that year.
The 24-year-old Indian defender commits long-term future with the Indian Super League club.
The duo, who joined from NorthEast United, have each signed three-year contracts till the end of the 2023-24 season.
Javi Hernandez has an experience of playing 37 matches in the ISL and even scored two goals in the final of the 2019-20 season against Chennaiyin FC.
Adding experience to their backline, ISL side Hyderabad FC have completed the signing of Spanish defender Juan Antonio Gonzalez, also known as Juanan.