The 26-year-old, with his trademark peroxide blond hair, was spotted during the team's training session at the club's grounds in southern France.
French police last month charged former All Black Ali Williams, who plays for rivals Racing 92, with buying cocaine and O'Connor with possession of the drug. Williams was also suspended by his club.
The pair were arrested on February 25 outside a nightclub near the Champs Elysees in possession of 2.4 grams (0.08 ounces) of the substance.
O'Connor was fined and Williams is due to appear in court charged with buying cocaine.
The pair will appear before a disciplinary commission of the French National Rugby League (LNR) on April 12. The date was put back Tuesday by two weeks at the request of the players.
O'Connor, who can play wing or fullback, appeared 44 times for Australia between 2008 and 2013. He made his debut at 18, the second youngest Wallaby in Australian rugby history.
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