Uefa is investigating "potentially discriminatory incidents" which took place during Germany's 2-2 draw with Hungary at Euro 2020.
It is believed the incidents relate to an anti-LGBT banner that was brought into Wednesday's game in Munich by Hungarian fans.
There were also reports of anti-LGBT chanting by some Hungarian supporters.
Last weekend, Uefa opened an investigation into similar incidents during Hungary's other group matches.
Germany needed a late goal from Leon Goretzka to salvage a draw which knocked out Hungary and set up Tuesday's meeting with England in the last 16.
The incidents came after Uefa refused a request from Munich's mayor for the stadium to be lit in rainbow colours for the game in protest at an anti-LGBT law in Hungary.
Munich mayor Dieter Reiter made the request in protest against a new law in Hungary that bans the sharing of any content seen as promoting homosexuality and gender change to under-18s.
Uefa says it denied the request because of the "political context" with Reiter describing Uefa's decision as "shameful".
Before kick-off on Wednesday, a protestor waving a rainbow flag invaded the pitch during the Hungarian national anthem and hoisted a rainbow flag into the air in front of Hungary's players before being tackled by stewards.
Germany fans wore rainbow flags, wigs and face masks to show their support for the LGBT community
Before their match against France in Budapest last weekend, Hungarian fans marched to the Puskas Arena displaying a banner calling on players to stop taking a knee to protest against racism.