aly Liverpool, Manchester City and Chelsea have all been handed a huge boost in their hunt for a new defender, after Napoli gave Senegalese star Kalidou Koulibaly the 'green light' to leave Stadio San Paolo this summer. The 29-year-old has been on the radar of Europe's elite clubs for a number of years now, and it appears the time has come for him to wave goodbye to Naples, after six years with the Serie A side. SSC Napoli v AS Roma - Serie A According to Tutto Napoli, Koulibaly's agent has...