Courbis, 62, resigned as Montpellier coach in December after two years in charge of the former champions.
He joined Rennes last week as Ruello's advisor and the club said in a statement that he would be assisted by Jacques Bayle. The Brittany side, who are sixth in Ligue 1, were knocked out of the French Cup 3-1 at home by Ligue 2 team Bourg en Bresse in their last 32 match on Tuesday.
Montanier, 51 and a former coach of la Liga side Real Sociedad, had been at Rennes since 2013.
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(Reporting by Julien Pretot, editing by Alan Baldwin)
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