Stephan Klossner - Football referee
| Euro 2021 u21 qualifiers | ||||
| Montenegro u21 | Macedonia u21 | 2019-10-10 | 1-2 | |
| UEFA Youth League 2019-2020 | ||||
| Group Stage | Real Madrid Youth | Galatasaray Youth | 2019-11-06 | 2-4 |
| Group Stage | PSG Youth | Real Madrid Youth | 2019-09-18 | 1-2 |
| Europa League 2019 - 2020 | ||||
| 3rd qualifying round | Valletta | Astana | 2019-08-15 | 0-4 |
| 2nd qualifying round | Shamrock Rovers | Apollon | 2019-07-25 | 2-1 |
| UEFA Youth League 2018-2019 | ||||
| group stage | Galatasaray Youth | Porto Youth | 2018-12-11 | 0 - 2 |
| group stage | Monaco Youth | Atlético de Madrid Youth | 2018-09-18 | 0 - 2 |
| Euro 2019 u21 qualifiers | ||||
| Finland u21 | Poland u21 | 2018-09-11 | 1 - 3 | |
| Europa League 2018 - 2019 | ||||
| qualifiers 3rd round | Ufa | Progres Niedercorn | 2018-08-09 | 2 - 1 |
| qualifiers 2nd round | Trakai | Partizan | 2018-08-02 | 1 - 1 |
| UEFA Youth League 2017-2018 | ||||
| group stage | Atlético de Madrid Youth | Qarabag Youth | 2017-10-31 | 0 - 1 |
| Europa League 2017 - 2018 | ||||
| group stage | Zorya | Ostersund | 2017-09-14 | 0 - 2 |
| qualifiers 3rd round | Apollon | Aberdeen | 2017-08-03 | 2 - 0 |
| Champions League 2017 - 2018 | ||||
| qualifiers 2nd round | Celtic | Linfield | 2017-07-19 | 4 - 0 |
| UEFA Youth League 2016-2017 | ||||
| play-offs | Maccabi Haifa Youth | Dortmund Youth | 2017-02-07 | 0 - 1 |
| WC 2018 qualifiers - Europe | ||||
| Bulgaria | Belarus | 2016-11-13 | 1 - 0 | |
| Euro 2017 u21 qualifiers | ||||
| Estonia u21 | Sweden u21 | 2016-10-06 | 0 - 3 | |
| Montenegro u21 | Czech Republic u21 | 2016-09-01 | 0 - 3 | |
| Europa League 2016 - 2017 | ||||
| group stage | Fiorentina | PAOK | 2016-11-24 | 2 - 3 |
| group stage | Qarabag | Liberec | 2016-09-15 | 2 - 2 |
| qualifiers 3rd round | AA Gent | Viitorul Constanta | 2016-07-28 | 5 - 0 |
| Champions League 2016 - 2017 | ||||
| qualifiers 2nd round | Crusaders | Kobenhavn | 2016-07-13 | 0 - 3 |
| UEFA Youth League 2015-2016 | ||||
| 1st round | Schalke 04 Youth | Ajax Youth | 2015-09-30 | 2 - 3 |
| Europa League 2015 - 2016 | ||||
| group stage | Dnipro | Rosenborg | 2015-12-10 | 3 - 0 |
| 3th qualifying round | Kukësi | Legia Warszawa | 2015-07-30 | 1 - 2 |
| 2nd qualifying round | Beitar Jerusalem | Charleroi RSC | 2015-07-23 | 1 - 4 |
| UEFA Youth League 2014-2015 | ||||
| group stage | Barcelona Youth | PSG Youth | 2014-12-09 | 0 - 0 |
| Europa League 2014 - 2015 | ||||
| group stage | Torino | HJK | 2014-10-23 | 2 - 0 |
| qualifiers 3rd round | Lyon | Mlada Boleslav | 2014-08-07 | 2 - 1 |
| Euro 2014 u19 | ||||
| group stage | Austria u19 | Portugal u19 | 2014-07-25 | 1 - 2 |
| group stage | Ukraine u19 | Serbia u19 | 2014-07-19 | 1 - 1 |
| WC 2014 qualifiers - Europe | ||||
| Andorra | Romania | 2013-10-11 | 0 - 4 | |
| UEFA Youth League 2013-2014 | ||||
| group stage | Anderlecht Youth | Olympiakos Youth | 2013-10-03 | 4 - 2 |
| Euro 2014 u19 qualifiers | ||||
| Faroe Islands u19 | Macedonia u19 | 2013-09-11 | 0 - 5 | |
| Turkey u19 | Faroe Islands u19 | 2013-09-08 | 2 - 0 | |
| Europa League 2013 - 2014 | ||||
| qualifiers 3rd round | Gefle | Qarabag | 2013-08-08 | 0 - 2 |
| Champions League 2013 - 2014 | ||||
| qualifiers 2nd round | Shakhtyor Karagandy | BATE | 2013-07-23 | 1 - 0 |
| Euro 2015 u21 qualifiers | ||||
| Spain u21 | Austria u21 | 2014-09-09 | 1 - 1 | |
| Israel u21 | Portugal u21 | 2013-11-18 | 3 - 4 | |
| Belarus u21 | Iceland u21 | 2013-03-26 | 1 - 2 | |
| Euro 2013 u17 qualifiers | ||||
| Kazakhstan u17 | Croatia u17 | 2012-10-16 | 0 - 2 | |
| Turkey u17 | Kazakhstan u17 | 2012-10-14 | 3 - 0 | |
| friendly | ||||
| Poland | Czech Republic | 2018-11-15 | 0 - 1 | |
| Senegal | Bosnia-Herzegovina | 2018-03-27 | 0 - 0 | |
| Austria | Slovenia | 2018-03-23 | 3 - 0 | |
| Spain | Bosnia-Herzegovina | 2016-05-29 | 3 - 1 | |
| Portugal | Belgium | 2016-03-29 | 2 - 1 | |
| Norway | Russia | 2014-05-31 | 1 - 1 | |
| Liechtenstein | Andorra | 2012-08-14 | 1 - 0 | |
| Europa League 2012 - 2013 | ||||
| qualifiers 1st round | Daugava Daugavpils | Suduva | 2012-07-12 | 2 - 3 |
| Euro 2012 u19 qualifiers | ||||
| elite round | Serbia u19 | Romania u19 | 2012-05-30 | 3 - 0 |
| elite round | Germany u19 | Serbia u19 | 2012-05-25 | 2 - 2 |
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