The defender from Manipur joins on a multi-year deal, following a stint at ATK Mohun Bagan in the previous campaign.
Das joins after a season-long stint with SC East Bengal and is currently the second highest capped player in the ISL with 107 appearances.
The 24-year-old becomes the Blues’ first acquisition of the summer, and will join the squad ahead of their upcoming AFC Cup Playoff clash against Eagles FC.