UEFA have confirmed that Carlos del Cerro Grande of Spain will take charge of Liverpool v Napoli in Group E while Jesus Gil Manzano is doing Leipzig v Benfica in Group G.
The German Felix Zwayer will be accompanied at the Mestalla by Sascha Stegemannn as the VAR, Harm Osmers as fourth official and Thorsten Schiffner and Marco Achmuller as assistant referees.
At the Camp Nou, the French refereeing team will be led by Clement Turpin while Francois Letexier will be the VAR. Karim Abed is the fourth official and Nicolas Danos and Cyril Gringore the linesmen.
In the Liverpool v Napoli match, Del Cerro Grande will be at Anfield and will have Jose Maria Sanchez Martinez to help him as VAR, Jose Luis Munuera Montero is the fourth official while Juan Carlos Yuste and Roberto Alonso are the assistant referees.
Finally, Gil Manzano will take charge of Leipzig v Benfica. Juan Martinez Munuera is the man in the VAR van, Diego Barbero and Angel Nevado are the assistant refs with Xavier Estrada Fernandez as fourth official.