Arijan Ademi's four-year doping ban has cast a cloud over Dinamo Zagreb's pivotal Champions League trip to face Arsenal.
Arsenal faces a crucial Champions League clash with Dinamo Zagreb on Wednesday but much of the pre-match talk has centered on a doping controversy from the reverse fixture.
Midfielder Arijan Ademi failed a drug test following Dinamo's surprise 2-1 victory over Arsene Wenger's side on matchday one and has been banned for four years by UEFA, though he has always protested his innocence.
Wenger has called for more stringent testing within football and claims there is a prevalent assumption within the sport that doping is not a major problem.