It sounds like a game of poker, bluff and counter bluff.
Someone is going have to give way sooner or later but who is going to give first. ...NC or Wanyama (or his greedy agents). Well my money is on NC to hold his nerve!
To some extent that's true but nobody HAS to give. Wanyama could just stay at Celtic this year. Then they'd have to accept a lower offer in January or next summer.