First Leg, 9-11 November 2017Northern Ireland – Switzerland
Referee: Ovidiu Haţegan (ROU, photo)
Assistant Referee 1: Octavian Șovre (ROU)
Assistant Referee 2: Sebastian Gheorghe (ROU)
Fourth Official: István Kovács (ROU)
Referee Observer: Marc Batta (FRA)
Croatia – Greece
Referee: Gianluca Rocchi (ITA)
Assistant Referee 1: Elenito Di Liberatore (ITA)
Assistant Referee 2: Mauro Tonolini (ITA)
Fourth Official: Luca Banti (ITA)
Referee Observer: Alain Hamer (LUX)
Sweden – Italy
Referee: Cüneyt Çakir (TUR)
Assistant Referee 1: Bahattin Duran (TUR)
Assistant Referee 2: Tarik Ongun (TUR)
Fourth Official: Hüseyin Göçek (TUR)
Referee Observer: Sandor Piller (HUN)
Denmark – Ireland
Referee: Milorad Mažić (SRB)
Assistant Referee 1: Milovan Ristić (SRB)
Assistant Referee 2: Dalibor Djurdjević (SRB)
Fourth Official: Srdjan Jovanović (SRB)
Referee Observer: Jaap Uilenberg (NED)
Second Leg, 12-14 November 2017
Switzerland – Northern Ireland
Referee: Felix Brych (GER)
Assistant Referee 1: Mark Borsch (GER)
Assistant Referee 2: Stefan Lupp (GER)
Fourth Official: Felix Zwayer (GER)
Referee Observer: Rune Pedersen (NOR)
Greece – Croatia
Referee: Björn Kuipers (NED)
Assistant Referee 1: Sander van Roekel (NED)
Assistant Referee 2: Erwin Zeinstra (NED)
Fourth Official: Danny Makkelie (NED)
Referee Observer: Nikolai Levnikov (RUS)
Italy – Sweden
Referee: Antonio Mateu Lahoz (ESP)
Assistant Referee 1: Pau Cebrián Devís (ESP)
Assistant Referee 2: Roberto Díaz Pérez (ESP)
Fourth Official: Jesús Gil Manzano (ESP)
Referee Observer: Vladimir Sajn (SVN)
Ireland – Denmark
Referee: Szymon Marciniak (POL)
Assistant Referee 1: Paweł Sokolnicki (POL)
Assistant Referee 2: Tomasz Listkiewicz (POL)
Fourth Official: Paweł Raczkowski (POL)
Referee Observer: Markus Nobs (SUI)