That’s the verdict of former Liverpool man Steve Nicol, who says the Brazilian’s past errors mean he’s not suitable for Jose Mourinho’s side.
Luiz impressed last season after returning to Stamford Bridge from Paris Saint-Germain and helped Chelsea win the Premier League.
He’s found the going tougher this term though and was heavily criticised for his performance in the Blues’ Champions League defeat to Roma last month.
Antonio Conte subsequently dropped Luiz for United’s visit to west London and there have been suggestions the two fell out in training.
The 30-year-old returned to Chelsea’s matchday squad for yesterday’s 4-0 win over West Brom.

vCard.red is a free platform for creating a mobile-friendly digital business cards. You can easily create a vCard and generate a QR code for it, allowing others to scan and save your contact details instantly.
The platform allows you to display contact information, social media links, services, and products all in one shareable link. Optional features include appointment scheduling, WhatsApp-based storefronts, media galleries, and custom design options.
Express Sport understands Mourinho is ready to swoop though if Luiz is ushered towards the exit by Conte.
However, Nicol has questioned why the United boss would want the former Benfica man at Old Trafford.
“It makes no sense,” Nicol explained to ESPN FC TV.
“Why would Manchester United bring in a guy who made his name with Chelsea as a centre-back, but he has a mistake in him?
“United set up to keep clean sheets and not playing out from the back.
“For Luiz, that’s what he’s good at.”