Chelsea are looking to Galatasaray defender Alex Telles to replace Filipe Luis according to the Daily Star.
The Blues are still interested in Augsburg's Baba Rahman and Napoli's Faouzi Ghoulam but are keeping an eye on the 22-year-old in case they fail to reach an agreement for one of the other two.
Filipe Luis, 29, left the club to rejoin Atletico Madrid, one year after his move to Stamford Bridge.
Last week, boss Jose Mourinho confirmed that he wanted to add a new left-back to his squad.
"In this moment we need a left-back because I think we are selling Filipe Luis now or tomorrow," the Portuguese said last week.