Chelsea are in the hunt to sign Cedric Soares, and re-sign Ryan Bertrand, both of Southampton.
After missing out on Danilo, who went to Manchester City, the Blues have now turned their attention to Southampton for their full-backs.
The Evening Standard reported that Chelsea boss Antonio Conte still firmly believes he can sign his number one target which is Alex Sandro, but he wants to have a variety of options.
With Premier League experience under their belt, it could allow them to challenge the current wing-backs of Chelsea, who were so ever impressive in their title win last season.
Chelsea have also been linked with Arsenal and England international Alex Oxlade-Chamberlain.