Lyon, hoping to reach the semi-finals of European club football's premier event for the first time, will host the Ligue 1 champions in the first leg on Tuesday before travelling to Bordeaux next week.
"Laurent Blanc says that we're the favourites but you know he's thinking exactly the contrary," Puel told reporters. "It's a way for him to take the pressure off his team."
"It will be tight with the advantage for Bordeaux to be at home in the return leg, which counts," Puel said.
"We know Lyon well, we face them in the league and see them play every weekend," Blanc told reporters. "Lyon probably have the same feeling. We know their strengths and weaknesses and they know ours. I don't think there will be many surprises, tactically speaking."
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