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Claudio Ranieri calls the crushing defeat of "Roma" to "Cagliari" club a "much needed slap in the face."
Italo-led "Roma" suffered a 1-5 defeat to their opponents away. This was the first such defeat for the capital's team since 1949.
"Conceding five goals is always painful, but at least it happened now," said Ranieri.
"It can be a much-needed wake-up call. When you concede four goals from set pieces, it is clear that the players lack concentration."
Asked why he substituted one of the leaders Francesco Totti after defender Nicolas Burdisso received a red card, the specialist said: "We had to reorganize our defense.
"I replaced the captain because we have a Champions League match against Bayern Munich coming up. I wanted him to rest."
