Rangers defender Madjid Bougherra has backed Rangers loan signing El Hadji Diouf to brush off any verbal attacks from home fans at Celtic Park on Sunday.
Diouf infamously spat at Celtic supporters while playing for Liverpool in the 2003 Uefa Cup quarter-final.
He was also the subject of a face-to-face goal celebration from Celtic captain Scott Brown in February.
"You see him in the last game," said defender Bougherra. "He is very professional and did not react."
Diouf has been involved in many controversial moments in his career,inculding the spitting incident and more recently the injury of Jamie Mackie in which QPR manager Neil Warnock described Diouf as a 'sewer rat' while QPR defender clint hill issued a warning that the Senegalese international that he 'will get whats coming to him'
But Bougherra expects the Senegal forward to make a positive contribution to a Scottish Premier League match on Sunday that could go a long way to deciding which of the two Glasgow clubs win the title.
"Off the pitch, he is a fantastic guy - he is funny, he is cool, he is a very nice guy. On the pitch, he is different. He wants to win and likes to battle, but you have to respect that."
Meanwhile Celtic captain Scott Brown later said his booking for celebrating infront of Diouf was 'best of his life'