He refereed his first senior international match in October that year, taking charge of Romania's 2–0 win over Luxembourg in UEFA Euro 2008 qualifying Group G. In February 2008, Brych was appointed to referee the 2007–08 UEFA Cup Round of 32 match between Panathinaikos and Rangers,[1] and in October 2008, he officiated the 2008–09 UEFA Champions League Group D match between Liverpool and PSV Eindhoven.

The match finished 0–0 after extra time, and went to a penalty shoot-out, which Sevilla won 4–2,[3] in what was considered a controversial officiating.

He was joined by assistants Mark Borsch and Stefan Lupp, and the fourth official was Serbian Milorad Mažić.

However, after controversially not awarding Serbia a penalty, FIFA made the decision that Brych would officiate no further matches at the tournament.

[9] At UEFA Euro 2020 he was rehabilitated and refereed one game of the Round of 16, Belgium's 1-0 win over Portugal, one quarter-final (England's 4-0 win over Ukraine) and finally the semi-final game of Italy against Spain at Wembley Stadium, London on 6 July 2021.