It's now confirmed that Diaz will play for Morocco and no longer be available to Spain.
Morocco will face Angola and Mauritania later this month.
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Diaz said just this week: "The best months arrive because it is when you play all the competitions.
"We are first in the League and in the quarterfinals of the Champions League. It is a very good moment for the team and we have to continue like this. Now, obviously, to win titles."