Chelsea are set for a triple raid on Atletico Madrid this summer.
A £32million fee for Diego Costa has long been agreed but the Blues are also closing in on a deal for left-back Filipe Luis and considering a shock return for Tiago.
Brazilian Luis fits the bill and was an integral part of the Atletico side that reached the Champions League final and lifted La Liga last season.
Southampton’s Luke Shaw was a target for the west London club but is expected to join Manchester United.
Mourinho’s pursuit of Tiago will raise a few eyebrows.
The 33-year-old spent an unspectacular season at Stamford Bridge during Mourinho’s first stint at the helm before leaving for Lyon in August 2005.
He is available on a free transfer from Madrid as his contract runs down in the Spanish capital and would add depth to the Chelsea midfield.
The trio are likely to be following on-loan goalkeeper Thibaut Courtois in making the journey to the Premier League as the young Belgian prepares return to his parent club.
Courtois has made a big impact during his spell at Vicente Calderon but is expected to sign a new contract with Chelsea after the World Cup.
Meanwhile, 20-year-old Nigerian defender Kenneth Omeruo has signed a new three-year Blues deal after spending the second half of last season at Middlesbrough.