Former Chelsea midfielder Tiago is set to become Jose Mourinho's first summer signing after coming to the end of his contract with Atletico Madrid, reports in Spain claim.
The Portuguese international played for Mourinho in the 2004-05 season before joining Lyon for £6.5m in order to get more playing time.
After spending two seasons at Juventus, he moved to the Vicente Calderon in 2009 where he has since become a pivotal player for the newly-crowned La Liga champions – and started the recent Champions League final defeat to Real Madrid.
Atletico boss Diego Simeone has been desperately trying to persuade the player to renew his contract at the Vicente Calderon but according to Marca Tiago has decided instead to return to Chelsea.
Marca claims that Mourinho has tempted him with a lucrative deal and also has assured him a crucial role in the squad after the Blues recently agreed to sell David Luiz to Paris Saint Germain – who has been playing as a holding midfielder for much of his Chelsea career.
With Frank Lampard's future at Stamford Bridge still up in the air, Tiago can bolster a midfielder where just Nemanja Matic and Ramires are only assured of their place.
Should Tiago complete his Chelsea return, he may not be the only Atletico player to swap the Vicente Calderon for Stamford Bridge this summer.
Loanee Thibaut Courtois is reportedly also set to return to west London while Diego Costa remains as Mourinho's first-choice to bolster the attack.
Meanwhile, reports in Spain claim that Mourinho is keen on bringing left-back Filipe Luis to Stamford Bridge to replace Ashley Cole.