East Bengal and Quess Corp's joint venture was terminated, and the club inked a partnership with Shree Cement as their principal investor in September.

[2] The next day the club signed former fullback Lalramchullova back from arch-rivals Mohun Bagan for the season[3] as well as the services of Hyderabad defender Gurtej Singh.

[4] On 18 April, the club announced a triple signing for the season: goalkeeper Rafique Ali Sardar from Jamshedpur, and Wahengbam Angousana and Loken Meitei from TRAU.

[5] The club announced the signing of three more Indian recruits: winger Bikash Jairu from Jamshedpur and midfielders Cavin Lobo and Sehnaj Singh from Punjab and ATK respectively, each on a two-year contract, on 28 April.

[7][8] The club announced four more signings: goalkeeper Sankar Roy from Mohun Bagan, defenders Mohammed Irshad from Gokulam Kerala, Keegan Pereira from Jamshedpur and Girik Khosla from Punjab on 5 May.

[9] The club announced three more signings on 15 May: midfielders Eugeneson Lyngdoh from Bengaluru, Mohammed Rafique from Mumbai City and Milan Singh from NorthEast United for the season.

[10] On 18 May, the club announced five more signings for the season: forward C. K. Vineeth from Jamshedpur, right-back Rino Anto from Bengaluru, left-back Pritam Kumar Singh from Kerala Blasters, defenders Anil Chawan from ATK and Vikas Saini from Mohammedan Sporting.

[27][28][29] The final termination, No Objection Certificate[29] and sporting right transfer was delayed,[30][31] but on 17 July, the joint venture with Quess East Bengal Pvt.

[37] By the end of July, Football Sports Development Limited (FSDL), unofficially stated there would be no expansion in the seventh season during a meeting with the ten ISL clubs.

[60] SC East Bengal announced the signing of four more foreigners: Aaron Amadi-Holloway[61] from Brisbane Roar, Anthony Pilkington[61] and Danny Fox[62] from Wigan Athletic and Matti Steinmann[62] from Wellington Phoenix.

[62] On 19 October, East Bengal announced the signing of their sixth foreigner, Congolese winger Jacques Maghoma, who had played for EFL Championship side Birmingham City in the previous season.

[117] Win Draw Loss Last updated: 27 February 2021 Source: Competitions East Bengal officially joined the Indian Super League as the 11th team after the FSDL accepted their bid documents.

[120] East Bengal made their debut in the Indian Super League on 27 November against their arch-rivals ATK Mohun Bagan at the Tilak Maidan Stadium in Goa.

However, the Red and Gold brigade suffered a 0–2 defeat in their opening game courtesy of strikes from Roy Krishna and Manvir Singh for ATK Mohun Bagan.

Hyderabad had a chance to equalise in the dying minutes of the first half as they were awarded a penalty kick, but Debjit Majumder saved Aridane Santana's spot-kick to keep the lead at halftime.

In the 69th minute, Halicharan Narzary tapped in the third for Hyderabad after Liston Colaco dribbled past the East Bengal defence to square it to him for the finish and take a two-goal lead.

East Bengal took the lead in the 13th minute after Mohammed Rafique's low grounder went inside the net, having been deflected off Kerala Blasters' defender Bakary Kone as an own goal.

[127] On 26 December, East Bengal faced Chennaiyin at the Tilak Maidan Stadium and came from behind twice to draw 2–2 courtesy of a brace from German midfielder Matti Steinmann.

[73] On 2 January, the team announced the double signing of Indian defenders Ankit Mukherjee from ATK Mohun Bagan and Raju Gaikwad, who played for Kerala Blasters last season.

In the 79th minute, Nigerian forward Bright Enobakhare, who had his first start for the team, scored a goal after dribbling past five Goa players to finish the ball and put East Bengal ahead.

[132] East Bengal played Bengaluru on 9 January at the Fatorda Stadium in their last game of the first leg of the 2020–21 ISL and secured their second win of the campaign by a 1–0 margin.

[134] On 11 January, East Bengal signed United's goalkeeper Suvam Sen as a replacement for Rafique Ali Sardar, who went on loan to Mohammedan Sporting.

[100][135] The team played Kerala Blasters in the return fixture at the Tilak Maidan Stadium on 15 January and scored a last-minute equaliser to earn a 1–1 draw.

The first half remained goalless, but it was Kerala Blasters who took the lead in the 56th minute as Jordan Murray scored past Debjit following a long ball from goalkeeper Albino Gomes.

[137] Two players from the previous season, Samad Ali Mallick and Abhishek Ambekar and new recruit Mohammed Irshad were de-registered and parted ways from the club.

Goa was down to 10-men in the 66th minute after Edu Bedia was showrn red card for double booking, but East Bengal failed to capitalise on the opportunity and shared the points with yet another draw.

[140] On 1 February, transfer deadline day, East Bengal announced the double signing of defender Sarthak Golui and midfielder Sourav Das from Mumbai City.

[141] Coach Robbie Fowler was handed a four-match ban and a fine by the tournament committee for making alleged "insulting remarks" about match officials of the Goa game in a post-match interview.

Peter Hartley pulled one back for Jamshedpur in the 83rd minute, but the Red and Gold brigade managed to hold on to the lead and grab their third win of the campaign and move to ninth place.

In the second half, David Williams put ATK Mohun Bagan ahead again following an error by East Bengal skipper Danny Fox in the 72nd minute.