Chelsea have made some high profile sales in the past that have come back to bite them, with the likes of Lukaku and De Bruyne becoming big stars after their sale.
However, Wilkins believes the decisdecision to sell Matic is worse than the sale of the other stars.
“It’s the worst decision I’ve ever seen,” Wilkins told Sky Sports.
“You’ve got a guy here who was paramount to Chelsea along with Kante in the middle of of the pitch, winning the title with Chelsea the year before and all of a sudden you’ve sold him to one of – or the biggest – rivals we have.
“I say we because I am a Chelsea supporter so I’m speaking from the heart when I speak. I just could not see that for the life of me. Why would we let Nemanja go there?
“He’s been outstanding for us and you’ve seen in the short period that he’s been there [at Man Utd] how he’s allowed Pogba to basically do what he wants.
“I just couldn’t see that piece of business at all.”
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