When discussing the finest centre-halves in European or world football, a few familiar names tend to crop up again and again. Virgil van Dijk, for instance. Ruben Dias, Marquinhos, William Saliba, Antonio Rudiger and a few more elite names. You could maybe add Lisandro Martinez to that collection, presuming the Manchester United favourite can rediscover his pre-injury best after another lay-off. But when the conversation turns to a man who was labelled the ‘best centre-back in the world right now’ as recently as May of last year, it seems those comments have not aged well. Man United, per The …