Liam Rosenior, the former Hull City defender, is Strasbourg's manager, and revealed his displeasure at how the club's fans behaved.
He said: "Emanuel Emegha was devastated, and I was too.
"I am very disappointed by what I saw, seeing a banner against one of last season's best players is unacceptable. My players deserve much better. They have an impeccable attitude and do not deserve this treatment. This is a pivotal season in which we will be playing in the European Cup, but it seems that a minority are unhappy with our performances.
"It won't change anything because I remain very proud of my players and Emanuel Emegha will remain captain as long as he is here. It must be emphasised that this does not concern everyone, but only a minority."