Despite completing deals for Michael Hector and Papy Djilobodji on deadline day, Chelsea boss Jose Mourinho is reported to have missed out on 34-year old Benfica star Luisao, according to the Daily Star.
The veteran Brazilian defender, capped 44 times by the Selecao, is reported to have been offered a two-year deal at Stamford Bridge.
However, reports indicate that the Lisbon giants were not willing to see their defender depart for less than the £14.7m buyout clause in his contract.
PSG defender Marquinhos is said to be another player the club missed out on in an effort to strengthen their back-line.
Some reports suggest that signing of Senegalese enforcer Djilobodji was only rubber stamped after the Portuguese side rejected Chelsea’s advances for their imposing centre half.
The West Londoners currently lie in 13th after a frustrating start to their title defence, with losses against Manchester City and Crystal Palace coming in the opening weeks of the season.