Barcelona are concerned about Arsenal's interest in Real Sociedad midfielder Mikel Merino.
Atlético Madrid are also expected to make a push, but Mundo Deportivo says Barcelona are most concerned about another club's interest.
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In March, it was reported that Arsenal were keeping an eye on the player - and Barcelona consider the English giants to be the biggest challenger in their hunt for Merino.
Barcelona do not yet know how much they can spend this summer - and therefore will need to wait to start negotiations for Merino.
Merino's contract with Real Sociedad expires next summer. According to reports, the midfielder has already decided not to extend.