By Tom Gott Chelsea have embarked on yet another expensive shopping spree this summer but, while new signings are important to this squad, departures are just as key. Not only do the Blues need to raise money to ensure they steer clear of potential sanctions next year – whether that’s more important to them than signing £60m-rated teenagers is a debate for another day – but Chelsea officials are also working to trim the wage budget, and there are plenty of players whose salaries are no longer sustainable. Here are four players who need to head on this summer. Romelu LukakuIt’s time for this ci…