With Spain's tournament preparations disrupted by a positive Covid-19 test in the squad, Villar was among a number of Under-21 squad members to be called up to fulfill the fixture.
And the 23-year-old ended up starting the game - also providing a clever assist as Brahim Diaz got on the scoresheet.
Congratulations, Gonzalo!
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Later on Wednesday, Villar took to social media to express his feelings.
"A very special day yesterday," Villar said.
"My debut for Spain - and with my family and friends in the stands. Keep chasing our dreams."
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