The 27-year-old left-back from Manipur has signed a three-year extension deal.
The Gaurs punched above their weight to hold Qatar's Al Rayyan, coached by renowned French World Cup winner Laurent Blanc, to a goalless draw.
The Spaniard guided the Mariners to the final in their first-ever ISL season only to lose the title to Mumbai City FC.
Blasters ended their campaign in 10th place with 17 points.
Igor Angulo scored a stoppage-time winner as FC Goa rallied to post a thrilling 2-1 win.
FC Goa tried their best through Igor Angulo and Ortiz to get the equaliser but Chennaiyin's defense was too tough to crack.
Aniket Jadhav's strike (53rs minute) was the difference between the two sides in what was the 500th game of the ISL.
This was Odisha's fifth defeat of the season and they are yet to record a win.
Santana's twin burst came in the 56th minute after SC East Bengal scored their first ever ISL goal through Jacques Maghoma in the 26th minute.
After three losses on the trot, laggards SCEB finally opened their account as they now have one point from four matches, while JFC moved to fifth place with six points from five games.