Speculation linking Chelsea defender David Luiz with a move to Spanish champions Barcelona has now been prevalent for some time, with the Brazilian not a regular starter under current Blues boss Jose Mourinho.
Per the Daily Star's Nick Lustig earlier this month, the Catalans' interest in securing his signature remains, and the January window offers the next opportunity for the club to make a move to capture their target.
Chelsea manager Jose Mourinho, though, has warned the Spanish side off making a move for the Brazilian per the Metro's Jamie Sanderson.
Luiz played in victory over Liverpool on the weekend, starting in a defensive midfield role. However, it was the first occasion he has been used in such a role, and it has generally been Gary Cahill preferred to partner club captain John Terry at the centre of defence.
While Luiz is a better natural footballer than the Englishman, Cahill is seen as a better stylistic match for Terry and a more predictable presence at the heart of the back four.
However, it would be a major mistake for the Blues to sell Luiz at this point.
At 26, the Brazil regular is now approaching what should be the peak years of his career and has undoubtedly been much improved over the past 12 months in a variety of roles.
While there have been issues regarding his compatibility with Terry, given his propensity to push out of defence, the England captain is now in what are the final years of his playing career.
Luiz's style may not match that of Terry, but he has shown in his performances on the biggest stages for Brazil that he is an excellent defender when put under pressure. He does, though, require a setup that allows him to play a more modern and aggressive defensive style.
Given his physical strength and technical ability, Luiz has the potential to be one of the very best defenders in world football if given freedom to play his natural game.
To sell him, while still yet to reach his full potential, would surely be a mistake given that the Blues will soon need a new leader of their defence once Terry decides to call time on his long and successful career.
Luiz is a natural leader and a very personable character, which has endeared him greatly to the Stamford Bridge faithful over the past few seasons.
Given responsibility and a team setup to make the most of his abilities, Luiz has all the required attributes to become a Chelsea legend.
There have been many in England who would have given up on the Brazilian after some of his mistakes in the early stages of his career in London. Should he move on, though, it would be no surprise to see him emerge as one of the world's best defenders at a club willing to play to his strengths.