Ever since becoming a pundit for Sky Sports, it's safe to say that Jamie Carragher hasn't been afraid of sharing his honest opinions on a wide range of issues, and one of those has been Chelsea summer signing David Luiz.
The 29-year-old Brazilian made a shock return to Stamford Bridge on transfer deadline day for a reported £34 million after two years at Paris Saint-Germain, and he's produced some good performances since manager Antonio Conte switched to a 3-4-3 system.
Carragher was a prominent critic of Luiz during his first spell in English football, however, on the latest edition of Monday Night Football, he appeared to change his tune and even predicted that just one thing is preventing the charismatic defender from being world-class.
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Chelsea have kept four league clean sheets in a row, and as the 38-year-old Liverpool legend analysed clips of Luiz's recent displays, he asked: "Why shouldn't David Luiz be a top defender?
"(He's) fantastic in the air there against (Robert) Huth, he's six foot three, six foot four, as powerful as any centre-back in the world, he can run, he's got pace - that's what you want from your centre-back."
Carragher added: "He can cope with anyone physically. The problem he has, which we actually think is his strength, is at times when he's on the ball. I think he gets too casual, he takes too many risks, he steps out (from defence), does something stupid.
"Maybe he doesn't feel he has the responsibility, (but) now he's got that responsibility in the centre (of a back three). It's not his job to go and step out. The only problem I see going forward for David Luiz in this setup is if he becomes bored and he's not getting involved.
"And then he does something stupid, he does step out, and it's not the instruction from Conte. But where he's playing now, in the centre of that back three, not stepping out, not using the ball, just being a defender, he's been outstanding."
There is no doubt that Luiz's good form has coincided with his manager's decision to implement a three-man defence following the heavy 3-0 defeat away to Arsenal last month.
Next up for the Blues is the visit of Ronald Koeman's Everton, who sit just four points and two places below them in the league table.
Do YOU agree with Carragher? Is Luiz close to being world-class? Have YOUR say in the comments box below!