Sallehuddin began his sporting career playing tennis under a government scheme,[5] representing Brunei at the Davis Cup in 1994 and 1995.

[7] Towards the turn of the century Sallehuddin found more playing time in expense of the ageing Martilu Mohamed on the left side of a back three, a formation favoured by David Booth and his successor Mick Jones.

He started the 1999 Malaysia Cup final alongside captain and fellow legend Liew Chuan Fue and first-season debutant Norsillmy Taha and claimed a 2–1 victory in Kuala Lumpur through two goals by Rosli Liman.

[3] Sallehuddin inherited the captain's armband from Liew and stayed with Brunei as the severely-depleted team were immediately relegated to Premier Two, managing only two wins and conceding the most goals (53).

Sallehuddin went with a team composed largely of QAF FC players for the 2006 AFC Challenge Cup held in Bangladesh, Brunei failed to advance from the group stage courtesy of goal difference.

[27] His final appearances for the national team were at the 2008 AFF Suzuki Cup qualifying held in Cambodia where he scored a penalty in the 76th minute against Timor-Leste in their only win from 4 games.