After trailing to a first-half penalty, the Black Cats responded strongly after the break, dominating proceedings and securing victory through goals from Brian Brobbey and Trai Hume.
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“It was a good second half performance - in line with our standards,” Le Bris told Sunderland website.
“Rennes are a good team, as expected. They’re good with the ball and good under pressure.
“We made it a bit easy for them in the first half.
“We needed to lift the intensity at half-time and we did just that.
“We imposed ourselves well in the second half.”
Sunderland will begin their 2025/26 Premier League campaign with a trip to Portman Road to face newly promoted Ipswich Town next Saturday,