A surprising star of Chelsea's Premier League title winning side, a fully fit Luiz was left out of the squad for United's visit to London before the worldwide break following suggestions of an argument with Antonio Conte relating to a 3-0 hammering in Rome a few days earlier.
Conte then revealed that he "doesn't know" if Luiz has a long-term future at Stamford Bridge.
The football world was shocked when Luiz was left out of the Chelsea squad to face United two weeks ago, with young defender, Andreas Christensen taking his place in the middle of the three-man defence, and the youngster impressed sufficiently as he marked out Romelu Lukaku for the entire duration of the game.
Andreas Christensen filled in for the player brought back to Stamford Bridge from Paris Saint-Germain on summer transfer window deadline day 2016, and Conte hailed the replacement's performance as wonderful.
Eden Hazard scored twice and Alvaro Morata was also on target in the comfortable win
The Premier League champions will lock horns with West Bromwich Albion on Saturday afternoon. Antonio Conte has had major issues with some Chelsea players with the likes of Costa and Matic leaving the club last summer despite being key members of two title winning squads. It was a tactical decision and every single player has to react well and accept the decision. I don't like that. "It's normal", Conte said at his pre-match press conference. "This is most important".
'Victor Moses is progressing well and I hope to have him back from tomorrow, for the game after Qarabag.
It's easy to understand why Conte is deflecting away from queries about his relationship with Luiz.More news: OH gubernatorial candidate: 'I was sexually intimate with 50 very attractive females'