Chelsea have entered talks with Atletico Madrid to pursue the services of Saul Niguez, Fabrizio Romano reports.
The Blues are considering a late move for a central midfielder, and have their sights on landing Saul.
The Spaniard has five years left on his Atletico contract, but he is no longer indispensable to the club.
With the arrival of Rodrigo De Paul, the La Liga champions are open to the prospect of parting company.
The Blues have initiated talks for his services, and have proposed a loan with an option to buy next summer.
Manchester United are also interested in the versatile midfielder, who can also operate in a holding role.
However, the club have yet to make any formal bid to sign the 26-year-old star.
Saul is prepared to test himself in the Premier League, but a move could be delayed until deadline day.
Atletico are weighing up offers for their prized asset, and may prefer a straight-cash agreement.
He is valued at €40 million by Transfermarkt, and they could command a higher fee for him.
Bayern Munich were also linked with him earlier this summer, but they are unlikely to make a move.
They recently handed a bumper contract to Joshua Kimmich, and Leon Goretzka could sign a similar one.