Martin was spotted at the age of 10 by Brighton & Hove Albion before moving to South East London based Slade Green and then Dartford.

Martin's time at Dartford proved productive, scoring 14 goals in 68 appearances and attracting the attention of Championship club Crystal Palace, who he joined for £25,000 in January 2007.

[2] Martin made his debut for Crystal Palace as a substitute in a 1–0 win over Southend United at Roots Hall in February 2007, but only spent a year at Selhurst Park, where a thigh strain and managerial changes meant he was restricted to just 14 appearances—primarily as substitute—before making the switch to Millwall for an initial fee of £50,000, rising to £100,000 depending on appearances.

His form attracted interest from Championship side Cardiff City, but Martin remained at Millwall for the 2009–10 season and played 21 times in the league, scoring three goals.

Although the deal fell through, Clough intimated a desire to make a fresh approach for Martin with the reopening of the emergency loan window on 9 February.

[5] Martin signed for Derby on loan until the end of the 2009–10 season on 9 February 2010, with a view to a permanent move on expiration of his Millwall contract.

[18] Injuries and poor form at the beginning of the 2013–14 season led to Martin falling out of first-team contention at Luton.

[21] Following his release by Stevenage he signed for National League South side Whitehawk in July 2015 and then joined Bromley for the 2016–17 season.