Lehkosuo started his managerial career with HJK youth teams quickly after retiring as a player. In 2005, he was appointed as assistant manager of Ville Lyytikäinen of Ykkönen (the second tier) side FC Honka. After Lyytikäinen was sacked, Lehkosuo became head coach. He guided the team to the top place of Ykkönen. In the first season in the Veikkausliiga Lehkosuo guided his team to a fourth-place finish. In 2007 Honka was again fourth. In 2008 Lehkosuo guided Honka to second place and to the UEFA Cup qualifications for the next season. In 2009 Honka was again second in the league table. Lehkosuo managed Honka until February 2014.
