Youth years 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 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.
Hoàng Anh Gia Lai On 2 December 2010, he signed a contract with
Hoàng Anh Gia Lai in the
Vietnamese Super League. In January 2013, Wanga joined
Floribert Ndayisaba in going on trial with Omani side
Al-Nasr.
Loan and return to A.F.C. Leopards At the beginning of the
2012 Kenyan Premier League, Wanga signed a loan deal with
A.F.C. Leopards until 11 November 2012. At the end of the season, Wanga sealed a permanent move to
Ingwe.
Al-Merrikh 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==