East Bengal
After the season ended Manandeep signed for East Bengal. He made his first-team debut for the club on 21 September 2012 against Sporting Goa in East Bengal's first match of the 2012 Federation Cup by coming on as a 59th-minute substitute for Baljit Sahni. Then two days later Singh scored his first goal for East Bengal against ONGC after converting an 80th-minute penalty which won East Bengal the game 2–1. Singh then scored a brace for East Bengal on 25 September 2012 against Kalighat MS to send East Bengal to the semi-finals of the Federation Cup. East Bengal won the match 4–3. Singh then scored for East Bengal in the Final of the 2012 Federation Cup on 30 September 2012 scoring in the 100th minute to give East Bengal a 2–1; eventually East Bengal won the game and the tournament 3–2.