UEFA announced the roster of Champions League referees for Newcastle vs. Barcelona, and Swedish famous Whistle Nibery enforced the law.
Newcastle vs. Barcelona referee list:
referee: Nibery (Sweden)
Assistant referee: Beggy (Sweden), Soderkwest (Sweden)
Fourth official: Radbeck (Sweden)
VAR referee: Brissard (France)
VAR assistant referee: Van der Rische (Belgium)