Unai Simón, Aymeric Laporte, Robin Le Normand, Alejandro Balde (Fran García), Dani Carvajal (Jesús Navas), Rodri , Mikel Merino (Oihan Sancet), Gavi , Álvaro Morata (Joselu ), Mikel Oyarzabal (Bryan Zaragoza), Ferran Torres.
Subs: Fabián Ruiz, David García, Kepa Arrizabalaga, Pau Torres, Ansu Fati, David Raya, Martín Zubimendi.
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Scotland
Angus Gunn, Jack Hendry, Scott McKenna, Ryan Porteous (Billy Gilmour), Andy Robertson (Nathan Patterson), Aaron Hickey, Callum McGregor (Kenny McLean), Scott McTominay, Ryan Christie (Stuart Armstrong), John McGinn, Lyndon Dykes (Ché Adams).
Subs: Jacob Brown, Liam Kelly, Liam Cooper, Greg Taylor, Lewis Ferguson, Zander Clark, John Souttar.
I'm not convinced this is a universal thing across UEFA. In the official Laws of the Game document there are pages on refereeing signals with no mention of these