Michalak signs for promoted Lyon
The 33-year-old Michalak, capped 77 times and his country's top international points scorer with 436, has been playing at Toulon since 2012.
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He has played more than 60 times in the European Cup and close to 180 times in the Top 14.
Michalak has also plied his trade in the Southern Hemisphere Super Rugby tournament with the Sharks over two spells.
"I want to give my maximum before my career ends. This is a club with a lot of ambition," he said.
Agence France-Presse