2 June 2011: Mohun Bagan make the first big signing and maybe the biggest signing of the season by signing three time I-League golden boot winner Odafe Onyeka Okolie to a $320,000 a year deal.[2]
3 August 2011: United Sports Club is renamed Prayag United S.C. after signing a six-year sponsorship deal.[10]
29 September 2011: Salgaocar win the 2011 Federation Cup with a 3–1 victory over last season's winners East Bengal.
18 October 2011: East Bengal win the 2011 Indian Super Cup over Salgaocar 9–8 in penalties after the match ended 0-0.
10 April 2012: HAL is officially relegated from the I-League after losing 4–6 to Pune at the Bangalore Football Stadium. This was further made true when Mumbai drew with Pailan Arrows. This means that on April 10 that HAL was 13 points below Mumbai who occupied the last 2012–13 I-League spot and with HAL at 23 games meant that HAL could only win 9 points.