Allan Wanga started playing while at primary school. As a youth he also played at various age levels for now defunct Kisumu based football club known as FIFA Kingdom. He then went to St Paul's High School, Shikunga in Butere District and continued playing there, although the school did not have a famous football team.
Early career
In 2005, he joined Kisumu-based Lolwe FC, then playing in Nationwide League, the second tier football league in Kenya. He only stayed three months though, because the Nationwide was being revamped and thus closed. He was set to join Agro-Chemical, but the move did not happen as he was threatened by Agro players fearing for their place in the team, according to Wanga. He then went home and was persuaded by his mother Noel, to join the army. He failed the army test, and got a chance at Sher Karuturi, another Kenyan top-flight club. After waiting for a contract offer, his brother Richard called him over a job offer in Canada, and Allan joined his brother in Nairobi but it did not materialise. After almost a year without a club, Lowle contacted him in late 2006 and he returned, but was picked up by Premier League club Tusker F.C., in early 2007. He played for Tusker until the end of 2007 season, when his club won the league. He managed to score 13 goals in his nine last matches for Tusker FC and 21 in total.
Petro Atlético
At the end of 2007, he moved to Angolan club Petro Atlético, turning down trial offers from Swedish clubs. He won the Angolan Premier League in his first year, Petro Atléticos first league title since 2001.
FC Baku
At the end of January 2010, he moved to Azerbaijani club FC Baku on a six-month contract but renewable for a year. After winning the Azerbaijan Cup his optional year contract was not taken up by Baku, and Wanga went on trial with Georgian side Rustavi Olimpi. When the deal hit a snag he called on Baku who could not issue him a work permit until after four months.
On 4 June 2014, Wanga agreed to a one-year contract with the Sudanese giants Al-Merrikh.
Azam
On 21 July 2015, Wanga agreed to a one-year contract with the Tanzanian club Azam FC. His first goal came in a Vodacom Premier League match against Stand United, During his one-year stay at Azam he was restricted to 11 appearances due to personal issues scoring 3 goals in the process.
Return to Tusker
In June 2016, Wanga completed a move back to his former side Tusker. On 17 July 2016, he played his first match back for the club in a 2–2 draw against Chemelil Sugar, coming on as a substitute for Michael Khamati in the 59th minute. He scored 4 minutes into injury time to put his side 2–1 up before having his goal cancelled out by Hillary Echesa a minute later.
International career
He made his debut for Harambee Stars on 27 May 2007, in a friendly against Nigeria. His first international goal for Kenya came on 8 December 2007 against Tanzania in a 2–1 loss at the 2007 CECAFA Cup. On July 08,2019 Wanga announced that he had retired from International football.
