Chelsea will be willing to match the release clause of Atletico Madrid left-back Filipe Luis, according to the Daily Mail.
Jose Mourinho has stepped up his search for a player in that position, following the departure of Ashley Cole at the end of last season.
The Brazilian has a buy-out clause of £21 million and could become the former Real Madrid boss’ third major pre-season signing as he prepares a major overhaul of the squad.
Chelsea have already sealed the signature of former Barcelona midfielder Cesc Fabregas and the arrival of Luis’ Diego Costa is imminent, while they have sold David Luiz to Paris Saint-Germain in a world record fee for a defender of £50 million.
Luis was an integral part of Atletico’s successful 2013/14 season. He made 32 appearances in the defence that conceded just 26 goals in 38 matches on their way to winning La Liga for the first time in 18 years.
The 28-year-old also appeared 10 times during the Champions League campaign which saw Diego Simeone’s men reach the final for the first time since 1975. They were just seconds away from victory over bitter rivals Real Madrid, but Sergio Ramos equalised to force extra-time before Atleti eventually succumbed to a 4-1 defeat.
His stellar performances earned him a place in the provisional 30-man Brazilian World Cup squad.
Luis began his career in his native Brazil with Figueirense, where his impressive displays caught the attention of Dutch side Ajax who gave him his first taste of European football.
After spending a year in the Netherlands, he was signed by Real Madrid in 2005.
He remained at the Bernabeu for one season, making 37 appearances for the B team in the process.
Deportivo La Coruna came calling that summer and secured a season-long loan deal for the defender, who started 10 times in La Liga and made a further nine appearances from the bench.
His loan at the Riazor was extended for a further year after they sold first-choice left-back Joan Capdevila to Villarreal, and Luis made 33 appearances as his temporary club finished ninth.
He signed permanently ahead of the 2008/09 season and his first European campaign after the club came through the Intertoto Cup. Luis was the only ever-present outfield player during the domestic campaign, while Deportivo also reached the knockout stages of the Europa League.
His final season with the Blues and Whites was hampered by a horrific injury to his right fibula, before Atletico came calling in the summer of 2010.
After establishing himself as first-choice in his first year at Vicente Calderon, he made 36 league appearances in his second season and a further 16 in the Europa League-winning campaign which provided his first silverware.
He was involved in La Liga 32 times the following campaign and the played the whole 120 minutes as they came from behind to beat Real in the final of the Copa del Ray.