The teenager appears to have some kind of problem with his back, although he did train as normal with the national team on Saturday.
Ahead of the session, Luis de la Fuente spoke to reporters about his squad and who could feature next time out against Turkey.
”I will make the decision at the last minute, I want to see this afternoon’s training, very important for us and then evaluate,” he said when asked about Ferran Torres.
De la Fuente then seemed to be referring to Yamal when he added: “I will assess whether there are more or less tired players, there are some blows, discomfort, but not important. There is no discomfort from any player that is important.”