Dutchman Verstappen, 20, is regarded as a definite champion of the future, but he has been signed up by Red Bull through 2020.
"I don't know what (Sergio) Marchionne will do, he is unpredictable," said Briatore.
"But with Raikkonen you will never win the constructors' title," the Italian and former Renault team boss told Rai radio.
"To win you need two good drivers, and Ferrari does not have that," he insisted.
"I would sign Verstappen with my eyes closed. He is the only real driver that people want to see -- a gladiator that they do everything to penalise in every race," he added.
Briatore also hailed Lewis Hamilton's 2017 title triumph, saying: "This year he was more motivated on the track than in the disco."
"I know Sergio well and like me he says what he thinks, although sometimes I'm a little more diplomatic," the Mercedes team chairman told La Gazzetta dello Sport.
"But I understand. They lost the championship -- it's right to be critical."
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