Samuel Chukwueze scored his maiden goal for AC Milan but the Rooseneri suffered a 3-1 home defeat to Borussia in their UEFA Champions League clash on Tuesday night. Olivier Giroud missed the chance to give the hosts the lead when he failed to convert from the spot in the sixth minute. Borussia Dortmund were awarded their own penalty four minutes later, which was colly converted by Marco Reus.