straight to your inboxPortuguese football expert Filipe Diaz believes Manchester City would be making a smart investment by signing Darwin Nunez.Transfer talk has already begun for the summer window at the Etihad Stadium, with Pep Guardiola's side linked with a host of strikers.Sergio Aguero is out of contract in the summer and his injury problems have clouded doubt over whether he will sign a new deal with the club.As a result, Man City are looking at potential options and have been linked with