Marcelo Bielsa has resigned as Marseille coach just one match into the new season.

Olympique Marseille began their Ligue 1 campaign with a 1-0 loss to Caen at the Stade Velodrome, after which Bielsa announced his departure.

The Argentinian's position had been a source of off-season speculation, with suggestions he could leave to manage Mexico, and a club statement read: "In the post-match press conference, Marcelo Bielsa announced he was standing down from his post as OM coach."

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OM's Twitter account carried several quotes from Bielsa's press conference.

"I am leaving my post as coach of OM," he said. "My work here is over, I will return to my country. I am not leaving here to take another job. I thank the supporters, who were always behind me during the matches and day to day. I have given all I have to this team."

The club also revealed Bielsa had confirmed his intentions in a letter to club president Vincent Labrune just before he entered the conference.

The news adds to a turbulent summer which has seen Marseille lose the spine of last season's starting line-up - defenders Rod Fanni and Jeremy Morel, midfielder Giannelli Imbula, winger Dimitri Payet and forwards Andre Ayew and Andre-Pierre Gignac have all left the club.

Andy Delort's well-taken 27th-minute goal was enough to condemn Marseille to defeat on Saturday as Michy Batshuayi, leading the line following Gignac's exit, missed a host of chances.