Chelsea are willing to listen to offers for, Andreas Christensen, Kurt Zouma, Marcos Alonso and Emerson Palmieri.
Over the last week or so, Chelsea have expressed interest in Leicester City's Ben Chilwell. The 23-year-old has impressed many over the past two seasons, and Frank Lampard is keen to sign the youngster.
However, the Blues aren't keen on splashing over £70 million on Chilwell. So, who else have Chelsea been linked with?
At the age of 27, Alex Telles has been targeted by many top European clubs for a while. The Brazilian has only missed two leagues games all season, in what has been yet another impressive campaign for the full-back.
Telles is more of an attacking-minded full-back with the urge to beat opposing defenders and look to cause havoc in the final third. With such an attacking mindset, Telles' defensive ability isn't where it should be for a top-rated full-back.
However, the Brazilian is a lot cheaper than Chilwell and is, therefore, an option for Frank Lampard.
Nicolás Tagliafico's name has also been mentioned. Again, Nicolás is a cheaper option for the Blues, should they choose not to go for Chilwell. Before the season was cancelled, with Ajax being crowned champions, Nicolás had played 24 out of Ajax's 25 league games this season.
The 27-year-old, born in Argentina, has the experience and was part of the Ajax side that reached the Champions League semi-final last year.
With the left-back wanting to leave Ajax in the summer, he's valued at around £23 million which is surprisingly cheap for a player with that amount of experience.
Lampard is keen to bolster the left-back position with Alonso and Emerson looking likely to leave Stamford Bridge at the end of the season. The Blues are not short of options, but Lampard hopes that Chilwell switches from Leicester to West London.