Two weeks before the resumption of the championship, Julien Stéphan’s men beat Real Sociedad (2-0).
The Bretons made the difference with a goal from their summer recruit Gronbaek (22e) and a goal from Gouiri in the second half (67e).
A final test could be carried out by the Reds and Blacks next Saturday against Werder Bremen. Stade Rennais will start its L1 season on Sunday August 18 (8:45 p.m.) against OL.