There seems to be some confusion in the question, as the actual matches mentioned for the Netherlands are against Hungary and Germany in the UEFA Nations League. According to Ronald Koeman’s squad announcement on October 4, 2024, Quinten Timber was indeed part of the Netherlands squad for the October international break, but there’s no information available about an injury replacement by Teun Koopmeiners specifically for Quinten Timber. However, Teun Koopmeiners is a Juventus player and has been part of the Netherlands national team, making appearances for the senior side since 2020.
It’s worth noting that Teun Koopmeiners has been dealing with an Achilles tendon injury, according to Juventus’ injury list. Given the lack of recent information on Quinten Timber’s injury and Teun Koopmeiners replacing him, it’s possible that the situation might have changed since the squad announcement.