Lucien Favre admitted his young players struggled to break down Club Brugge after Christian Pulisic's late goal earned Borussia Dortmund a 1-0 win in their Champions League opener .
Favre handed a place in his starting line-up to 18-year-old playmaker Jadon Sancho, but it was second-half substitute Pulisic, on his 20th birthday, who turned the game with his strike in the 85th minute.
The result ensured Dortmund remain unbeaten in five games in all competitions this season, but Favre pulled no punches when discussing the challenges his players faced during a first half in which they were second best.