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German referee Felix Brych, the man who holds all the power within his whistle, is one of the best-known referees in the world and one of UEFA's most trusted officials.
And players will know not to get on the wrong side of him, either, especially after his involvement in Portugal's last-16 exit to Belgium - a match in which he dished out five yellow cards without even blinking.
Not afraid to stamp his authority on games and brandish his coloured cards, Brych will be joined tonight by his German compatriots Mark Borsch and Stefan Lupp as his assistants, while Marco Fritz will be in charge of VAR.
Brych's fourth official, Sergio Karasev from Russia, is the only change from his usual team, replacing Spaniard Carlos del Cerro Grande on the touchline between the dugouts.
In eyebrow-raising circumstances, the 45-year-old was joined by his German counterparts, including two assistant referees, a video assistant referee and three assistant video referees. We know, it looked dodgy.
During the 90 minutes, however, Brych failed to brandish either side a yellow card, though he did have a word a few times with some certain players.
But with this being the Germans last game in charge at this summer's showpiece, will he use the semi-final as an excuse to get his coloured cards out again? Perhaps, but will we have to wait and see.