Bordeaux tweeted a picture of Contento signing his contract before posting a story on their website confirming the transfer from Bayern.
The transfer was completed soon after Bordeaux confirmed they had sold another left-back - Lucas Orban - to Valencia.
"As soon as we started talking about bringing in a left-back, we knew that Contento could be an interesting opportunity," Sagnol said.
"He spent five years with the Munich first-team squad, even if he didn't play all that often. He's played in the Champions League against French clubs. He's a highly motivated player who'll be out to prove what he's capable of."
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