Bayern Munich boss Thomas Tuchel was left livid after Josip Stanisic, who is on loan at Bayer Leverkusen, scored against his parent club.
Bayer Leverkusen prevailed with a 3-0 victory, with Stanisic amongst the scorers. The 23-year-old is on a season-long loan from Bayern, who he joined as a youth player in 2017.
Whereas in the Premier League players who are on loan are not permitted to play against their parent clubs, that rule doesn't apply in the Bundesliga.
Former Chelsea manager Tuchel expressed his bewilderment that such a scenario is allowed to happen.