After finishing top goalscorer in Switzerland two years running he was transferred to French side Stade Rennais in 1998 for a and later moved to AS Monaco in 2000 again for €20 million, to replace David Trezeguet. His performances, including those in the 2004 UEFA Champions League Final, earned him a move to Serie A club A.S. Roma on a three-year deal in 2005, for which he earned €1.8 million in gross per season. (however the tax rate including regional tax may have added up to around 50%) However, he never lived up to his potential – partly due to a knee injury sustained while at Monaco – and spent the 2006–07 season on loan at English side Blackburn Rovers. While at Blackburn, Nonda announced his intention to sign a permanent deal, Blackburn opted not to sign Nonda on a permanent deal and he later signed for Turkish club Galatasaray in August 2007 on a two-year deal. On 28 January 2010, Galatasaray released him by mutual consent.