The former Brazilian international replaces Laurent Banide, who was sacked on Monday evening after less than one season at the helm.
Ricardo spent the last two seasons in charge of Ligue 1 rivals Bordeaux, guiding Les Girondins to success in the Coupe de la Ligue where they beat Lyon in the final.
© Copyright PA Sport Ltd 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms