[2] Born on 6 June 1979,[3] Purushothaman spent his youth career by playing for Kerala Varma College and University of Calicut.
[5] After an impressive performance with the side, he was included in the Kerala football team's squad for the 2001–02 Santosh Trophy tournament.
[20] On 6 February 2021, Kerala Blasters announced that they have roped in Purushothaman as the new head coach of their reserves team.
[25] On 10 July 2023, Kerala Blasters announced the appointment of Purushothaman as the new assistant coach for their first team on a three-year contract, until 2026.
[27] Purushothaman later made history, as the Blasters registered their first ever away win against southern rivals Chennaiyin FC in the league on 30 January 2025 under his helm.