The Giallorossi scraped into the Europa League in sixth place and Pizarro barely played until Vincenzo Montella replaced Claudio Ranieri on the bench.
"The campaign was below our expectations and we take responsibility for that," the Chilean midfielder told Sky Sport Italia.
"The team had been reinforced, but on the field could not express its full potential. We thought this could be the right year for Roma, but instead I'd give us four out of 10."
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