[citation needed] In August 2009, Wei Long signed a one-year contract to play for the Singapore Slingers along with 7 other local players.

[1] He scored a season high of 14 points, including 4 3-pointers against the Brunei Barracudas on 18 October 2009, the opening night of the inaugural ASEAN Basketball League.

[citation needed] On 29 November 2011, Wei Long, together with Shengyu Lim and Desmond Oh, formed the first trio of Singaporeans that signed new contracts with the Slingers for the 2012 Asean Basketball League season.

[citation needed] For the 2013 season, pursuing a higher education at Nanyang Technological University, Wei Long signed a new contract with the Slingers with a partial commitment, which sees him missing out on most of the teams' away games.

This performance topped his previous career-high of 20 points against the same team on 17 February 2013, the Singapore Slingers Cancer Awareness night.