UEFA has announced the referees for the first round of fixtures in the Europa League group stage, where Roma, Milan and Napoli are involved.
Polish referee Daniel Stefanski has been assigned the Group F tie between Napoli and AZ Alkmaar at the San Paolo on Thursday.
Meanwhile, the match between Young Boys and Roma, which kicks off at 17.55 UK time the same day, has been given too Spanish match official Carlos del Cerro Grande.
Milan face Celtic at Hampden Park at 20.00 UK time, with Slovenian Matej Jug on the whistle.
This week’s Europa League referees
Napoli-AZ Alkmaar: Stefanski (POL)
Young Boys-Roma: Del Cerro Grande (ESP)
Celtic-Milan: Jug (SLO)