The fourth official's board flashed bright red and green near the touchline. But before that moment came, Thiago's legs were already starting to burn, not from the game, but from the relentless warm-up Klopp had ordered.
"More intensity, come on! You'll be going in soon," Zeljko Buvac shouted from the sideline, waving his arms like a man trying to direct traffic in a thunderstorm.
Thiago jogged back and forth along the sideline, his boots pounding against the dry grass at the edge of the pitch. Mario was next to him, silent, but there was a twitch in his jaw that told Thiago everything, he was just as fired up.
The noise inside the Stadio Friuli was deafening. Udinese fans roared with every touch their players made, the drums in their curva thundering in rhythm. Dortmund's small pocket of traveling fans fought to be heard, yellow and black scarves waving high, but the home crowd swallowed most of the sound.
