By Andrew Gastelum The Premier League giants are in the market for multiple defenders after losing Antonio Rüdiger and Andreas Christensen so far this summer. View the original article to see embedded media. Chelsea is reportedly finalizing the transfer of center back Kalidou Koulibaly from Napoli in a €40 million ($40.3 million) move, according to ESPN. The 31-year-old defender is due in London to complete his medical ahead of signing a long-term contract while the club is also pursuing a return move for Manchester City defender Nathan Aké, ESPN confirmed. As a four-time Serie A Team of the Y…