Head coach Ronald Koeman was leading a training session for the reserves and substitutes following the Netherlands' 5-2 win over Bosnia and Herzegovina in the UEFA Nations League, which involved both Weghorst and Timber, who came off the bench. The Arsenal man put in a late tackle that Weghorst thought should have been given as a foul and was left furious at his international team-mate as per ESPN. The Ajax striker eventually took off his shirt and threw it to the ground before walking out of the session.