It was a good start for the Germans as they defeated Inter Milan in their first game of the group stage.
Sane, a former Manchester City player, scored the first goal of the game midway through the first half.
A clever one-two involving Sane and Coman led to an own goal by Danilo D'Ambrosio, which was the final goal of the game.
It was only the beginning of a group which also contains Barcelona and who thrashed Viktoria Plzen.
The team had 21 attempts on goal and 11 on target.
They might have won by a bigger margin, but Onana did a good job of keeping Sadio out of the game.
Inter will play a game in the Czech Republic next week.