The Nerazzurri moved six points clear of second-placed Roma with a 1-0 win over Torino on Sunday, and their rivals were also dealt a blow with top scorer Francesco Totti ruled out for the rest of the season with a serious knee injury.
But with four games remaining, Cruz said: "We have extended our gap to Roma. But we still have to work hard in order to further extend our lead over the Giallorossi. Anything can happen in football, and until we are not certain of having conquered the Scudetto, we will not ease up."
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