Barca earned a 1-1 draw at the San Paolo for the first-leg of their Champions League round 16 tie.
“Napoli were playing with a line of four and practically a line of six beyond that, so it was impossible to find spaces," complained Busquets to El Chiringuito.
Busquets was booked and Arturo Vidal sent off, so both will be suspended for the second leg on March 18.
“We're a bit short on options at the moment, so we have to reinvent ourselves."
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