Chelsea have two targets: Frenkie de Jong and Bernardo Silva. However both of them are very tough ones. Frenkie de Jong is likely to be kept by Barcelona this summer but there is still a slight chance for a possible transfer. As for Bernardo Silva, Manchester City aren't thinking about selling him now. He is important for his team and they wouldn't even want to sell him to a rival team I guess. Therefore Chelsea had better have some backup plans.