Sahal Abdul Samad had put the Blasters in front in the 23rd minute before Barreto returned to score against his former club with an equaliser in the 48th minute.
Chennaiyin FC face FC Goa next at home on October 21 while Bengaluru FC will be on the road again as they visit defending champions Hyderabad FC on October 22.
In a closely fought match, Chennaiyin FC came out on top to beat East Bengal 1-0 away from home. Vafa Hakhamaneshi scored the solitary goal of the match.
FC Goa enjoy 10-8 head-to-head record against Chennaiyin FC in ISL. Get CFC vs FCG live streaming details.