There could be a lot of transfer activity at Chelsea in the summer. That is at least what some of Chelsea‘s Premier League rivals reportedly believe. According to The Telegraph, clubs in the English top flight are convinced that the Blues are going to have to make sales by the end of June to avoid running into profit and sustainability trouble. And one player who could be sold is Marc Cucurella, with the same outlet claiming that his future at Stamford Bridge is in doubt. Cucurella has not played a game since December because of injury. Chelsea bought the left-back from Brighton & Hove Albion …