Manchester United boss Erik ten Hag has praised Lisandro Martinez as being one of the best trainers at the club. You could argue that Lisandro Martinez is the key lieutenant for Erik ten Hag. If he’s fit, he starts and he was one of the first signings of the Ten Hag era, following the United boss from Ajax. Martinez’s injury woes have been a major problem for United as there just aren’t many players like him around – especially in the United squad. Ten Hag may well want another naturally left-sided centre back this summer to cover for Martinez, but the Argentinian is clearly his main man… Erik…