Nicklas Bendtner has been warned by the Danish Football Association against a repeat of his goal celebration stunt against Portugal, in which he breached sponsorship rules.
After nodding home for a second time against the Portuguese on Wednesday, Bendtner lifted his shirt and lowered his shorts to reveal the name of an Irish betting firm across the top of his underpants.
UEFA rules bar players from wearing any sponsorship advertising on their kit, while the Danish national side have an exclusive understanding with a British gambling company.
Denmark's associates and European football's governing body have been left unimpressed by Bendtner's actions, and he has been warned as to his future behaviour.
"We have an exclusive deal and this is, of course, a breach of it," said Danish FA spokesman Lars Berendt.
"And it's also a breach of UEFA's commercial rules, rules against exposing personal messages."
UEFA have yet to raise an official complaint, meaning Bendtner is likely to be let off the hook, and the Arsenal striker, who spent the 2011/12 campaign on loan at Sunderland, claims it was not his intention to cause controversy.
"I was happy after having scored to make it 2-2, so I celebrated like I normally do," he said.
"But it was not a conscious thing on my part. It was simply some underwear that give a little luck. I also wore them in the first match and have worn them before.
"Of course I can see it's a bit unfortunate. But there is no agreement or anything like that. It was just for myself."