Borussia Dortmund coach Thomas Tuchel hailed last-gasp match-winner Park Joo-ho after his side came from behind to beat Krasnodar 2-1 in their Europa League opener.
New signing Park marked his first appearance for the German side by heading home a decisive goal in injury time from a Matthias Ginter cross.
Park had earlier set up Ginter's equaliser after Pavel Mamaev had given the Russians an early lead in the Group C encounter at Signal Iduna Park.
Tuchel said in his post-match press conference: "I know Park Joo-ho and I know that you can rely on him 100 per cent.
"It was not easy for him -- new team, new surroundings, various positions. It took him a while to find his flow, but he worked through it. This bears witness to his great heart.
"Park had to fight some cramps during the game, so it's impressive that he went for the winner in the final minutes."
Dortmund were not at their fluent best but the result maintained their fine start to the season, having now won 10 in succession since Tuchel took charge.
The Germans did dominate the second half but Tuchel acknowledged his team made a sluggish start.
He said: "It took a long time to find our way into the game. I thought our passing and body language looked sloppy.
"We needed time to get used to new personnel and positions. We had a few defensive mishaps and overlooked some spaces offensively."