"Of course it is!" Keown told the Daily Mail, when asked if £75m is too much for a defender.
"Liverpool are paying a premium for Virgil van Dijk because of the flashes we saw last season.
"This time last year he was starting to hit the heights but since returning from injury his attitude has been all wrong.
GETTY
Former Arsenal defender Martin Keown has questioned Liverpool-bound Virgil van Dijk
Virgil van Dijk scores outrageous free kick in training
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"He did not play for the first month of the season and has seemed to be sulking at not being allowed to leave Southampton.
"How strong is he mentally?"
Van Dijk could make his Liverpool debut in an FA Cup Merseyside derby clash with Everton next Friday.