If Seattle doesn't want to pay him the monster contract they're going to be forced to take the best offer that they can get. Not sure how they have any leverage to dictate the price if they wait until after the season is over. If they are going to keep him they should get him an extension now rather than waiting for the WR market to continue to go higher and higher.
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https://seahawkswire.usatoday.com/2022/04/07/seahawks-d-k-metcalf-market-value-projection-next-contract/