Chelsea have paid Brighton a fee rising to £62m for the Spain left-back.
Keown reckons the defender isn’t worth the exorbitant fee, and feels the Blues brought him in panic.
He told talkSPORT: “Chelsea have gone out and paid £60-odd million for Cucurella – I think that’s nonsensical.
“It’s an incredible amount of money. I think it’s too much. Cucurella, as good as he is, I think there are still players out there that are better.
“To pay that kind of money with Ben Chilwell still there, [Marcos] Alonso’s still there.
“It does feel like it’s panic buying.”