[4] Anumanthan was one of five youth players shortlisted for the inaugural Dollah Kassim Award in 2010, which was eventually won by future Young Lions teammate Ammirul Emmran.

Anumanthan was a vital member in the 2016 squad which almost made history by qualifying for their first ever AFC Cup, after a solid campaign for the club that year.

After Anumanthan is done with his National Service commitments, in January 2019 he returned to his former club, Hougang United ahead for the 2019 Singapore Premier League season.

On 26 July 2023, Anu captained the Sailors against English giants, Tottenham Hotspurs in a friendly match at the Singapore National Stadium.

[10] He made his senior debut for Singapore in a 2015 AFC Asian Cup qualifying match against Oman on 14 August 2013, coming on for striker Indra Shahdan Daud in the 70th minute.

[13][14] A quick, aggressive, physically strong, aerial ability and tenacious defensive-midfielder, Anu is known for his work-rate and hard-tackling style of play.