Jerome Roussillon has been without a club since leaving Union Berlin in the summer [Getty Images]Charlton Athletic have signed former Montpellier and Wolfsburg defender Jerome Roussillon on a "short-term" contract.The 32-year-old has experience of playing Champions League and Europa League football and links up with the Addicks to provide cover at left-back, with Josh Edwards currently out injured.Roussillon represented France at youth level before opting to play for the Guadeloupe national team