Right-back
While there have been questions about the centre-back pairing, Gary Cahill and Kurt Zouma should still do a decent job next season for the Blues. A position that really needs a fresh face has to be the right-back slot which only has Branislav Ivanovic as the only known face.
Ivanovic also has struggled immensely this season and Chelsea do need to bring in someone who can deal with pacey and tricky wingers, something that the Serb struggled to deal with this season. Chelsea have the bucks to get some big names in and it all depends on who comes up to take the managerial position at the club.