UEFA Champions League – Round of 16 (First Leg)

12 February 2013
Celtic – Juventus
Referee: Alberto Undiano Mallenco (ESP, photo)
Assistant Referee 1: Roberto Diaz Del Palomar (ESP)
Assistant Referee 2: Jesus Calvo Guadamuro (ESP)
Additional AR 1: Fernando Teixeira Vitienes (ESP)
Additional AR 2: Cesar Muniz Fernandez (ESP)
Fourth Official: Raul Cabanero Martinez (ESP)
Referee Observer: Uno Tutk (EST)

Valencia – Paris St. Germain
Referee: Paolo Tagliavento (ITA)
Assistant Referee 1: Mauro Tonolini (ITA)
Assistant Referee 2: Lorenzo Manganelli (ITA)
Additional AR 1: Andrea De Marco (ITA)
Additional AR 2: Antonio Damato (ITA)
Fourth Official: Riccardo Di Fiore (ITA)
Referee Observer: Donald McVicar (SCO)

13 February 2013
Real Madrid – Manchester United

Referee: Felix Brych (GER)
Assistant Referee 1: Mark Borsch (GER)
Assistant Referee 2: Stefan Lupp (GER)
Additional AR 1: Marco Fritz (GER)
Additional AR 2: Tobias Welz (GER)
Fourth Official: Thorsten Schiffner (GER)
Referee Observer: Bertrand Layec (FRA)

Shakhtar Donetsk – Borussia Dortmund

Referee: Howard Webb (ENG)
Assistant Referee 1: Michael Mullarkey (ENG)
Assistant Referee 2: Darren Cann (ENG)
Additional AR 1: Michael Oliver (ENG)
Additional AR 2: Andre Marriner (ENG)
Fourth Official: Stephen Child (ENG)
Referee Observer: Jean Lemmer (LUX)