Lazio have told Manchester City to up their offer for fullback Aleksandar Kolarov.
City have bid £15 million for the Serbia international in the past week.
However, Lazio president Claudio Lotito is demanding £20 million to part with Kolarov.
Real Madrid have cooled their interest in the Serbian wide man, but it is almost certain Kolarov will leave Lazio this summer.
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