The former Liverpool defender had nothing but praise for Atletico Madrid's Filipe Luis.
Jamie Carragher was discussing the 28-year-old during his analysis of Brazil's 7-1 loss to Germany, stating his disbelief that Luis wasn't picked for Brazil's World Cup squad.
The Brazilian was instrumental in Atletico's La Liga winning campaign, as well as their run to the Champions League final.
And Carragher feels Luis' exploits made him the best left-back in Europe last season.
"I’m still astonished that Atletico Madrid’s Filipe Luis is not in the squad never mind the team as I didn’t see a better left back in Europe last season - or in this competition to date," the 36-year-old wrote in the Daily Mail.
Carragher's suggestion is that Luiz Felipe Scolari's side would have fared a lot better defensively this tournament had Luis made the trip, especially against the Germans.
Real Madrid left-back Marcelo was Scolari's first-choice instead and the ex-Liverpool man feels he was poor all tournament.
"It started with Marcelo, who has been poor from game one, and can’t defend," he said.
"He was trying to be clever with a step-over, followed by a blind pass. Germany broke, he scampered back and conceded the corner and was then apologising."
Luis is expected to complete a move to the Blues this summer but Chelsea are yet to agree a fee with Atletico.
Ashley Cole was released by the club this summer, with the 33-year-old having moved to Serie A side Roma ahead of the coming campaign.
That leaves Jose Mourinho with Ryan Bertrand as his most senior left-back, although Cesar Azpilicueta, naturally a right-sided defender, was Mourinho's first-choice full-back on the left side of defence last term.