Cascarino believes Spurs will be ruing the decision not to go after Silva.
While Kane has struggled with just one Premier League goal, the City star has been sensational.
Cascarino told talkSPORT: “If you could get Bernardo Silva in the deal and lose Kane, you'd get a bit of money but you'd get Silva.
“He might not want to leave City and he might not want to go, that was a great option.
“That conversation was this summer about Bernardo Silva as it wasn't certain he'd stay at City. From the start of the season, he's just been fantastic."
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