The French winger was a firm favourite at Marseille before leaving for Bayern in 2007 after just two years at the club.
His part in France's dismal 2010 World Cup campaign and a subsequent international ban meant he fell from grace but a small crowd still cheered him on arrival in France on Tuesday.
"The people here are fond of football. I love football, I do my best, I'm always at full gear," Ribery told a news conference when asked about his two-year stay in southern France.
"When I had the ball, the people were expecting something to happen. It helped me to be more confident."
"I don't know what to expect as of tomorrow. I am a Bayern player now. I don't think the people will support me and shout 'Ribery! Ribery' for 90 minutes," he said.
He set up three of Mario Gomez's four goals when Bayern destroyed Basel 7-0 in their Champions League last 16 return and Marseille's players are particularly aware of the threat.
"I played with him for a year. He showed how gifted he was. He really challenges defences, Marseille forward Mathieu Valbuena said.
"But we should not focus on him. There will be other players to look after, he added, citing Arjen Robben.
"It will be difficult. Marseille are willing to produce a strong showing, to please the crowd. They will be big hearted, very aggressive," Ribery said.
"The real fans, the ones who love football, you can only find them here in Marseille."
"They play with a lot of emotion, with much passion," Heynckes said when asked about the main danger for his side.
He said he was not worried about Ribery's return.
"I did not notice any change in his behaviour. When the draw took place, he was willing to face Marseille," Heynckes said.
