[10] He was included in the Blasters' squad for the 2021 Durand Cup as their third choice keeper,[11] and was benched during the game against Delhi on 21 September 2021.
Sachin was then included in the Blasters squad to train with them on a developmental role for the 2021–22 Indian Super League season.
Sachin then played for the reserves in the 2022 RFDL, held from 2022 April to May, where the team emerged as the runners-up and qualified for the Next Gen Cup.
[17] He played for the side in the Next Gen Cup held in United Kingdom in July 2022 and received positive reception for his performance throughout the tournament.
[26][27] On 17 July 2023, Kerala Blasters announced that Sachin has signed a three-year contract extension with the club, that would keep him with them until 2026.
[28] He made his first appearance of the season against Gokulam Kerala FC on 13 August in the 2023 Durand Cup, which they lost 3–4 at full-time.
[29] Sachin kept his first official clean-sheet for the senior team on 21 August against the Indian Air Force in a 0–5 victory.
[1] He made his Indian Super League debut for the club on 21 September in the season opener against Bengaluru FC at home, which the Blasters won 2–1.
[40] After being sidelined for six months, Sachin came back to action on 23 August against Bengaluru FC in the 2024 Durand cup quarter finals by coming as a substitute for the injured Som Kumar in the 5th minute.
[46] At schooling level, Sachin secured an A-plus in all subjects for both SSLC and higher secondary public examinations.