"We will support any criminal action against those involved, and should evidence point to involvement of Chelsea season-ticket holders or members the club will take the strongest possible action against them, including banning orders."
The club are likely to face a Uefa investigation into the conduct of their fans.
Paul Nolan, who filmed the clip, told the Guardian: "He was obviously completely shocked when they pushed him off. I don’t think he realised who they were.
"He then tried to get on again and got pushed off a second time. There definitely was a culture shock. I heard a couple of French guys saying: 'I can’t believe this. It’s insane.'"