Chelsea and Juventus are in talks to sign Atletico Madrid defender Stefan Savic, according to Sky in Italy.
Savic, a former Manchester City player, has spent three seasons with Atleti since joining the club from Fiorentina in 2015.
The 27-year-old Montenegro international made 36 appearances for the club last season and was an unused substitute in the Europa League final against Marseille.
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Juventus are looking to bolster their defensive ranks after allowing veteran full-back Stephan Lichtsteiner to join Arsenal on a free transfer earlier this summer.
Chelsea, meanwhile, are expected to sign reinforcements this summer after missing out on Champions League football following their fifth-place finish in the Premier League.
Atletico Madrid completed the signing of defensive midfielder Rodri in May, while the Spanish club have also reached a preliminary agreement with Monaco for the transfer of Thomas Lemar.
However, Antoine Griezmann could be on his way out of the Wanda Metropolitano after admitting he has made a decision about his future, with Barcelona heavily linked with the France international.