Port Adelaide champion Kane Cornes has slammed Carlton following the club's monster contract offer for Zac Williams.

The Giants decided not to match Carlton's reported six-year deal on Friday, with the offer reportedly worth as much as $900,000 per season.

The figures place Williams as one of the league's highest earners, who plans on playing in the Blues' midfield next season after playing a majority of his football in Sydney as a defender.

Cornes blasted the offer Carlton put forward to the 26-year-old, stating the club have overpaid the speedster.

โ€œIโ€™d be asking Carlton why they think Zac Williams has turned into Chris Judd over one off-season,โ€ he said on AFL Trade Radioโ€™s The Early Trade.

โ€œIf the numbers are to be believed, and we believe they are true, it is ridiculous money to pay for a half-back flanker that theyโ€™re hoping to turn into a midfielder.

โ€œIโ€™d like to know from the Blues what theyโ€™ve seen in Williams โ€“ heโ€™s been in the top five of a best and fairest once, averages under 20 disposals a game.

โ€œHe has good speed and heโ€™s tough and I like him, but thereโ€™s questions over his engine. Is he a full professional the way he turns up to train and play?

โ€œThe question Iโ€™d be asking why they think heโ€™s Chris Judd over one off-season.โ€

The Giants were handed pick 10 as compensation for losing Williams to the Blues.