Moroccan 1500m star Adil Kaouch has been suspended after failing a doping test at last month's Golden League meeting in Rome.
Kaouch tested positive after winning this race in Rome
Kaouch, who took silver at the last world championships in Helsinki, tested positive for an unnamed substance after winning the 1500m at the meet.
Kaouch is currently awaiting the results of his "B" sample.
Kaouch was expected to be among the medal contenders at this month's world championships in Osaka, Japan.