The Ghana international was linked with a move away from OM in a local newspaper after it emerged he had changed agents.
The 22-year-old has denied the claims in a statement release on Marseille's official website.
"It's absolute rubbish," he said.
"Changing agent is one thing, changing club is completely different. To say changing agent means obligatorily changing club is just a lazy association and doesn't reflect the reality of the situation.
"I never said I wanted to quit Marseille."