| Referee | Games |  |  | Cards per game |
|---|
| Əliyar Ağayev | 3 | 14 | 0 | 4.7 (4.7 / 0.0) | |
| Mohammed Al-Hakim | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Yevhen Aranovskiy | 1 | 8 | 0 | 8.0 (8.0 / 0.0) | |
| Petr Ardeleanu | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Þorvaldur Árnason | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Deniz Aytekin | 2 | 12 | 1 | 6.5 (6.0 / 0.5) | |
| Mykola Balakin | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Benoît Bastien | 3 | 10 | 0 | 3.3 (3.3 / 0.0) | |
| John Beaton | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Ivan Bebek | 2 | 2 | 0 | 1.0 (1.0 / 0.0) | |
| Vladislav Bezborodov | 2 | 13 | 0 | 6.5 (6.5 / 0.0) | |
| Kevin Blom | 1 | 6 | 0 | 6.0 (6.0 / 0.0) | |
| Tamás Bognár | 2 | 9 | 0 | 4.5 (4.5 / 0.0) | |
| Serhiy Boiko | 3 | 12 | 0 | 4.0 (4.0 / 0.0) | |
| Alexandre Boucaut | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Jérôme Brisard | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Felix Brych | 4 | 12 | 0 | 3.0 (3.0 / 0.0) | |
| Ruddy Buquet | 2 | 8 | 0 | 4.0 (4.0 / 0.0) | |
| Cüneyt Çakır | 4 | 16 | 1 | 4.3 (4.0 / 0.3) | |
| Trustin Cann | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Kevin Clancy | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Willie Collum | 3 | 7 | 0 | 2.3 (2.3 / 0.0) | |
| Nikola Dabanović | 2 | 7 | 0 | 3.5 (3.5 / 0.0) | |
| Andrew Dallas | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Jørgen Daugbjerg Burchardt | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Ricardo De Burgos Bengoetxea | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Carlos Del Cerro Grande | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Carlos del Cerro Grande | 2 | 6 | 1 | 3.5 (3.0 / 0.5) | |
| Marco Di Bello | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Alain Durieux | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Andreas Ekberg | 2 | 7 | 0 | 3.5 (3.5 / 0.0) | |
| Espen Eskås | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Aleksei Eskov | 2 | 7 | 0 | 3.5 (3.5 / 0.0) | |
| Javier Estrada Fernández | 2 | 11 | 0 | 5.5 (5.5 / 0.0) | |
| Ádám Farkas | 1 | 11 | 2 | 13.0 (11.0 / 2.0) | |
| Horațiu Fesnic | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Bartosz Frankowski | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Juri Frischer | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Mattias Gestranius | 3 | 14 | 0 | 4.7 (4.7 / 0.0) | |
| Paweł Gil | 2 | 4 | 0 | 2.0 (2.0 / 0.0) | |
| Jesús Gil Manzano | 3 | 6 | 0 | 2.0 (2.0 / 0.0) | |
| Jesús Gil Manzano | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Filip Glova | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Serdar Gözübüyük | 2 | 4 | 0 | 2.0 (2.0 / 0.0) | |
| Iwan Griffith | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Orel Grinfeeld | 3 | 9 | 0 | 3.0 (3.0 / 0.0) | |
| Marco Guida | 2 | 5 | 0 | 2.5 (2.5 / 0.0) | |
| Alexander Harkam | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Robert Harvey | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Ovidiu Hategan | 4 | 22 | 1 | 5.8 (5.5 / 0.3) | |
| Robert Hennessy | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Alejandro Hernández Hernández | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Dennis Higler | 2 | 10 | 1 | 5.5 (5.0 / 0.5) | |
| Arnold Hunter | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Sergei Ivanov | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Nikolai Ivanov | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Adrien Jaccottet | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Krzysztof Jakubik | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Enea Jorgji | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Srđan Jovanović | 3 | 6 | 1 | 2.3 (2.0 / 0.3) | |
| Fran Jović | 2 | 5 | 0 | 2.5 (2.5 / 0.0) | |
| Matej Jug | 2 | 12 | 0 | 6.0 (6.0 / 0.0) | |
| Georgi Kabakov | 2 | 3 | 1 | 2.0 (1.5 / 0.5) | |
| Sergei Karasev | 4 | 15 | 0 | 3.8 (3.8 / 0.0) | |
| Viktor Kassai | 2 | 5 | 0 | 2.5 (2.5 / 0.0) | |
| Chris Kavanagh | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Jakob Kehlet | 2 | 2 | 0 | 1.0 (1.0 / 0.0) | |
| István Kovács | 3 | 13 | 0 | 4.3 (4.3 / 0.0) | |
| Pavel Královec | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Peter Kralovic | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Mads-Kristoffer Kristoffersen | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Ivan Kružliak | 3 | 13 | 0 | 4.3 (4.3 / 0.0) | |
| Bjorn Kuipers | 2 | 11 | 0 | 5.5 (5.5 / 0.0) | |
| Alexey Kulbakov | 4 | 14 | 0 | 3.5 (3.5 / 0.0) | |
| Jonathan Lardot | 2 | 9 | 1 | 5.0 (4.5 / 0.5) | |
| Harald Lechner | 3 | 14 | 0 | 4.7 (4.7 / 0.0) | |
| François Letexier | 2 | 3 | 0 | 1.5 (1.5 / 0.0) | |
| Kirill Levnikov | 1 | 2 | 1 | 3.0 (2.0 / 1.0) | |
| Jens Maae | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Bobby Madden | 4 | 16 | 0 | 4.0 (4.0 / 0.0) | |
| Danny Makkelie | 5 | 21 | 1 | 4.4 (4.2 / 0.2) | |
| Szymon Marciniak | 5 | 23 | 1 | 4.8 (4.6 / 0.2) | |
| Juan Martínez Munuera | 1 | 6 | 0 | 6.0 (6.0 / 0.0) | |
| Tiago Martins | 3 | 6 | 0 | 2.0 (2.0 / 0.0) | |
| Davide Massa | 3 | 3 | 0 | 1.0 (1.0 / 0.0) | |
| Antonio Mateu Lahoz | 6 | 28 | 1 | 4.9 (4.7 / 0.2) | |
| Gediminas Mazeika | 3 | 19 | 0 | 6.3 (6.3 / 0.0) | |
| Halil Meler | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Benoît Millot | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Dumitru Muntean | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Antti Munukka | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Ville Nevalainen | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Bas Nijhuis | 2 | 5 | 0 | 2.5 (2.5 / 0.0) | |
| Ola Nilsen | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Glenn Nyberg | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Michael Oliver | 3 | 11 | 0 | 3.7 (3.7 / 0.0) | |
| Pavel Orel | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Daniele Orsato | 5 | 20 | 1 | 4.2 (4.0 / 0.2) | |
| Halis Özkahya | 3 | 5 | 1 | 2.0 (1.7 / 0.3) | |
| Ali Palabıyık | 3 | 10 | 0 | 3.3 (3.3 / 0.0) | |
| Bojan Pandžić | 1 | 5 | 1 | 6.0 (5.0 / 1.0) | |
| Anastasios Papapetrou | 2 | 7 | 0 | 3.5 (3.5 / 0.0) | |
| Craig Pawson | 2 | 12 | 0 | 6.0 (6.0 / 0.0) | |
| Irfan Peljto | 2 | 4 | 0 | 2.0 (2.0 / 0.0) | |
| Radu Petrescu | 2 | 8 | 0 | 4.0 (4.0 / 0.0) | |
| João Pinheiro | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Nikola Popov | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Paweł Raczkowski | 3 | 10 | 0 | 3.3 (3.3 / 0.0) | |
| Roei Reinshreiber | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Don Robertson | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Gianluca Rocchi | 4 | 23 | 1 | 6.1 (5.8 / 0.3) | |
| Donatas Rumšas | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| José Sánchez Martínez | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Sandro Schärer | 3 | 13 | 0 | 4.3 (4.3 / 0.0) | |
| Robert Schörgenhofer | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Manuel Schüttengruber | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Anastasios Sidiropoulos | 2 | 8 | 0 | 4.0 (4.0 / 0.0) | |
| Tasos Sidiropoulos | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Daniel Siebert | 2 | 11 | 2 | 6.5 (5.5 / 1.0) | |
| Damir Skomina | 4 | 15 | 0 | 3.8 (3.8 / 0.0) | |
| Artur Soares Dias | 4 | 14 | 0 | 3.5 (3.5 / 0.0) | |
| Aleksandar Stavrev | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Daniel Stefanski | 2 | 4 | 0 | 2.0 (2.0 / 0.0) | |
| Tobias Stieler | 2 | 8 | 0 | 4.0 (4.0 / 0.0) | |
| Duje Strukan | 1 | 1 | 0 | 1.0 (1.0 / 0.0) | |
| Anthony Taylor | 5 | 26 | 1 | 5.4 (5.2 / 0.2) | |
| Vilhjálmur Þórarinsson | 1 | 7 | 1 | 8.0 (7.0 / 1.0) | |
| Kristo Tohver | 2 | 12 | 0 | 6.0 (6.0 / 0.0) | |
| Andris Treimanis | 2 | 8 | 0 | 4.0 (4.0 / 0.0) | |
| Clément Turpin | 4 | 17 | 1 | 4.6 (4.3 / 0.3) | |
| István Vad | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Paolo Valeri | 2 | 9 | 0 | 4.5 (4.5 / 0.0) | |
| Fábio Veríssimo | 1 | 2 | 0 | 2.0 (2.0 / 0.0) | |
| Slavko Vincic | 3 | 10 | 0 | 3.3 (3.3 / 0.0) | |
| Felix Zwayer | 3 | 19 | 0 | 6.3 (6.3 / 0.0) | |
England