AS Roma striker Marco Borriello says they're not performing at optimum levels after defeat at Napoli.

Roma are struggling in the bottom half of the table and Borriello feels they have no excuses.

He said: "If we look at the squad, then Roma are on the same level as the biggest sides in Europe: Chelsea, Inter, Bayern Munich and so on.

"This means it's only our fault if we can't get the important results."

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