The signing of a central defender depends on exits and the club have to fund the purchase of a striker and a right-footed winger too. There are two questions to answer on the issue: why Chelsea are pursuing another player in this position at all and what are the ramifications for those centre-backs at the club?

Everton boss David Moyes has been speaking to the media before Saturday's Premier League game at Chelsea (kick-off 12:30 BST). Here are the key lines from his news conference:

However, Maresca believes progress has been made and accused external figures of failing to recognise it. "Compared with the last two years, it's quite clear there is an improvement," he added. "If you want to see it, you see it. If you don't want to see it, you don't see it. Depends which way [you look]. I see it.

Enzo Maresca insists his first season at Chelsea has not been a failure after criticism of the Italian's conservative tactics in the race to qualify for the Champions League."How many times in the last two years have Chelsea been in the Champions League places?