Barca coach Hansi Flick blasted his Spain counterpart Luis de la Fuente ahead of last night's win against Valencia after Lamine Yamal returned from international carrying an injury.
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It meant the teen missed the 6-0 win on Sunday and Deco said: "With the issue of international matches, we already know that players often return injured.
"We've seen it recently with (Frenkie) De Jong. Also with Lamine. I agree with what the coach said. We need to improve communication between the clubs and the national team.
"The players are under a lot of strain. Lamine is a very important player. We all have to be more careful."