Speaking to talkSPORT, the 71-year-old said: "I'm doubtful about De Ligt. He didn't get into the national team during the Euros, he was a squad member. He's been at two enormous football clubs, they normally don't like to sell players. That in itself tells a story. I'm not sure he is what Man United needs at this time. Jonny Evans played 23 times for Man United, they desperately need a centre-half. I look at De Ligt, he's a lightweight centre-half. What you want from a centre-half first and foremost is to defend."