David Luiz's future at Chelsea is shrouded in mystery after head coach Antonio Conte appeared to suggest the defender had caused issues in the squad before missing his side's 1-0 win over Manchester United.

The Chelsea boss insisted prior to kick-off the Brazilian's omission was a "tactical decision", with Andreas Christensen lining up in the centre of defence and Ethan Ampadu on the bench.

But after seeing Alvaro Morata score the only goal of the game at Stamford Bridge on Sunday, Conte was more forthcoming with his assessment of the situation.

"[David Luiz] can get on with the other players or he sits in the stand," he told Sky Sports. "If he deserves to play, he plays; if not, he's in the stand."

When directly asked if the Brazilian has a future at Chelsea, Conte replied: "I don't know."

In his post-match news conference, Conte attempted to clarify the state of affairs by reverting to his earlier position that David Luiz had been dropped for tactical reasons.

He added: "It's only a tactical decision, only a tactical decision, only a tactical decision. It's normal. This can happen to every one of my players, if I see that they are not in good form. It's normal."

Asked if he meant to sound uncertain about David Luiz's future at the club in the previous interview, Conte appeared to go back on his comments.

"No... [checks with press officer]. I think that I have a squad. I have a squad with 16 senior players, and five young players. I have these players, and then I repeat I have to make the best decision for the team. I try to do this," he said.