The win meant that Lyon finished top of Group I and although they were not at their best, Garde said that the most important thing was the result.
"The main thing is to have qualified and won the group," he told Ligue1.com. "Not everything's perfect.
"We predicted we'd have a few difficult moments this evening, but the reaction the players showed in the second half was full of character. At half-time, I tried to keep the players' confidence high. They needed to take the shackles off."
Lyon return to Ligue 1 action on Sunday to take on Marseille.