John Toshack feels Barcelona need to find a quality centre-half this summer.
Toshack feels their defence has struggled this season.
"Injuries to Victor Valdes, Gerard Pique and Carles Puyol, Tata Martino has had no luck," said the former Real Madrid coach.
"I don't like Javier Mascherano as a centre-back. It's a very important area of the pitch.
"Barca have a job on this summer. They have to sign a centre-back."
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