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The defender bundled the ball into his own net in the 76th minute under pressure from Cody Gakpo.
England's Jude Bellingham was slapped with a fine for a crotch-grabbing gesture at Euro 2024.
The gesture is linked to the 'Grey Wolves', an ultra-nationalist youth branch of Turkey's Nationalist Movement Party, an ally of President Tayyip Erdogan's ruling AK Party.
‘It was a match where we reflected the team spirit from the first minute to the last minute,’ said Turkey coach Vincenzo Montella.
As well as two reds, the referee also showed 16 yellow cards to set a new Euros disciplinary record.
Turkey must avoid defeat on Wednesday to the Czech Republic, who drew 1-1 with Georgia earlier on Saturday, to be certain of qualifying for the knockout rounds.
Guler became the youngest player to score on his debut at a Euros aged 19 years and 114 days - beating Cristiano Ronaldo's record.
An injury-time strike by Erleta Memeti propelled 100th-ranked Kosovo to nine points from three matches and gave them their second title in a row.
Israel's Defence Minister denounced Turkey over the detention, accusing it of acting like an arm of Hamas.
The Turkish Football Federation's disciplinary board imposed a permanent ban on Koca, who entered the field and hit Meler when the final whistle blew after Rizespor scored a 97th-minute equaliser at Ankaragucu's Eryaman Stadium.