The 31-year-old has played for Barcelona, AC Milan and Ajax during his career - clubs which will each face Celtic in Group H. The Swede first experienced the atmosphere at Parkhead while with the Dutch club - a 1-0 win in a Champions League qualifier which was played in front of a crowd of 58,575 - and has yet to play in a match which has emulated the experience.
"When I played for Ajax we came to Celtic in the Champions League qualifiers," said the Paris Saint-Germain forward. "When I got out on the pitch I tried to communicate with my team-mates, but I heard nothing. The crowd were too loud to hear anything. It was an incredible atmosphere, probably the best I have experienced."