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Mawene started his career at Lens, featuring in the semi finals of the 1999-2000 UEFA Cup at Highbury against Arsenal. In the summer of 2000, Derby County signed Mawene for £500,000. He played 60 games for the Rams and in 2003/04 he was Derby's Player of the Season. In the summer of 2004 Mawene moved to Preston on a free transfer where he played under current Dons boss Craig Brown. His good form that year was rewarded with the Player of the Season award. In 2005/06 Preston reached the play-offs for the second season in a row and in the 2008/09 season he helped Preston to, again, reach the play-offs. Youl then signed for newly promoted Greek side Panserraikos, bringing an end to his 10 years in English football before moving to Aberdeen for free in the summer of 2011. He made his debut against St. Johnstone in the opening game of the season and has since partnered Andy Considine in the centre of defence, forming a formidable partnership.