Face it guys, if he has a good World Cup he'll be in and around the Chelsea first team, an indifferent/average World Cup and he'll go out on loan for another year, and if he's going anywhere it will be to Spain.
Chelsea are raping Athletico for players at the moment, he'll be sent there for a year to replace Costa and learn football the Spanish way. If he succeeds he'll be back the following year in the Chelsea Squad, if he fails Chelsea will cash in and get £25M-£30M for him of most teams in Europe that can afford him.
Valencia also want him on loan and they've brought Villa, Silva, Mata etc as players in recent years.