The Spain U21 international still qualifies for the African nation.
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And he said, "You can never close anything.
"I am very happy in the Spanish team, I have great friends and every time I go I feel very proud."
Diao also said: "This summer I played the European Under-19 and made myself available to the squad from the start. We are many players and I assume there will be times when more and less.
"Now I am being able to have good performances and what I have to do is keep it."
