The 17-year-old midfielder passed his medical with the Spanish second division club on Wednesday morning before putting pen to paper on a deal that will keep him at the Anoeta stadium until June 30, 2008.
The Barcelona-born Merida was one of the players newly-appointed Sociedad chief Inaki Badiola pledged to bring to the Basque club during the lead-up to the recent presidential elections, which he won.
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