The Scottish FA is writing to UEFA for clarification over Scott McTominay's disallowed goal in Thursday night's 2-0 loss in Spain.
The Manchester United midfielder looked to have put Scotland ahead in the second half, however, following a VAR check his free-kick was ruled out by Dutch referee Serdar Gözübüyük.
It appeared the goal was initially disallowed for a foul by Jack Hendry on goalkeeper Unai Simon but was then attributed to offside - with the Scotland defender deemed to be interfering with play and impacting Simon's ability to save the shot.
Sky Sports News understands the SFA wants clarity on the decision-making process and chronology of seemingly conflicting events.
However, a UEFA source confirmed to Sky Sports News on Friday that McTominay's strike was chalked off for offside against Hendry by referee Gözübüyük.
Spain won the Euro 2024 qualifier in Seville 2-0 but Scotland - who remain top of Group A - could still qualify for next year's tournament in Germany if the Spaniards avoid defeat in Norway on Sunday.
Failing that, Scotland visit Georgia and then are at home to Norway next month as they look to seal a spot at consecutive European Championships under Steve Clarke.
"At the time, we think it is a goal," the Clarke said, when asked about the incident. "You know when the referee gets told to look at it, he is probably going to chalk it off. They have made the call, there is no point in me going on about it.
"I think there was a little bit of confusion at the time, whether it was offside or for a foul on the keeper.
"If you take those two together, Jack Hendry was marginally offside and when he steps towards the goalkeeper, they have interpreted that as Jack being involved in the play but I will tell you now there
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