During the 2002–03 season, he was spotted by Wimbledon whilst playing for Dulwich Hamlet in the FA Youth Cup, and was offered a place in the Dons academy set-up.
In August 2004 he signed a three-year deal with Championship team Brighton & Hove Albion, having impressed on a trial basis.
[6] Upon his recovery he joined Swindon Town on a one-month loan deal on 19 January 2006,[7][8] making his debut for the club two days later in a 4–2 victory over AFC Bournemouth.
[11] Jarrett made one Premier League appearance for Watford, coming on as a substitute for Tommy Smith 71 minutes into a 1–0 defeat to Bolton Wanderers at the Reebok Stadium on 9 September 2006.
[13] Having returned from Boston, he was immediately loaned to Milton Keynes Dons for the remainder of the season,[14] where he played five games.
He joined Southend United on trial in August 2007,[15] however a knee injury caused him to miss the duration of the 2007–08 season.
[31] In February 2011, he joined on loan at Aldershot Town,[32] after wishing to play the first team football he was denied at Lincoln.
He departed Sincil Bank on 28 March after his contract with the Imps was terminated by mutual consent,[34][35] after the club wished to cut costs.
[39] On 27 January 2012, he joined Bromley after impressing in a friendly for them against a Queens Park Rangers development side.
He has impressed in his first season at Bromley, picking up Man of the Match awards on several occasions, including some from The Non-League Paper.
[40] After making just one appearance in the Sutton United first team, he made a return to Dulwich Hamlet[41] of the Isthmian League Premier Division, making his debut as a substitute on 12 November 2014 against Maidstone United,[42] some 12 years after originally signing first team forms at the club.
[47] He played a further four games for his country,[48] and despite wishing to put his club career ahead of his international career,[49] he earned another cap on 5 September 2010, when he appeared for Sierra Leone in a 1–1 draw with Egypt in a 2012 Africa Cup of Nations qualification match in Cairo.