Born in Eraviputhenthurai, Tamil Nadu, Soosairaj first moved to Chennai when he attended Madras Christian College.[1] At the age of 10, he started training with his local football club/academy St. Catherine, one of the oldest football clubs in the state. He represented the college in Inter-University tournaments before joining Arrows Football Club of the CFA Senior Division.[1] After spending time with Arrows, Soosairaj joined another CFA Senior Division side, Chennai City.[1] He also played for Tamil Nadu in the Santosh Trophy.[2]
In December 2016, Chennai City FC were announced as a direct-entry side into the I-League, India's top-tier football league.[3][4][5] He made his professional debut for the club on 4 December 2017 in Chennai City's second match of the 2017–18 season against Gokulam Kerala. Pandiyan started and played the whole match as Chennai City drew 1–1.[6] On 17 January 2017, Soosairaj made his professional debut in the I-League for Chennai City against DSK Shivajians. He came on as a 61st-minute substitute for Malsawmfela despite Chennai City losing 2–0.[7]
On 8 April 2018, Soosairaj scored his first professional goal in the league against Minerva Punjab. His 41st-minute goal was the first in a 2–0 victory.[8] He then scored his second goal of the season a few weeks later on 22 April against Churchill Brothers. This time, Soosairaj scored Chennai City's only goal in the 54th minute as they lost 5–1.[9] The next season, Soosairaj scored his first brace, scoring twice against Churchill Brothers on 17 February 2018. His two goals contributed to a 3–1 victory for Chennai City.[10] He then scored his third goal of the season a couple weeks later on 2 March against Minerva Punjab. His 5th-minute goal was the first in a 2–1 victory for Chennai City.[11]
On 9 March 2018, it was announced that Soosairaj had signed for Jamshedpur of the Indian Super League.[13] He scored 4 goals in 14 matches during the 2018–19 season. He was brilliant throughout the season playing as a left or right winger . He earned a lot of admiration for his performance. He was one of the standout Indian players of the season, and his performances led to him gaining his first international call-up.
ATK
Before the start of the 2019–20 season, Indian Super League side ATK activated the release clause of Michael Soosairaj as ₹90 lakh (equivalent to ₹1.1 crore or €140,000 in 2023)[14] Soosairaj scored against Mumbai City FC this season, assisting ATK in a 2–0 win.[15]