Saints expected to be very interested in former Packers/Cowboys HC Mike McCarthy [McCarthy will interview early next week]

SAINTSFAN said

I think there was an exclusive negotiating window after contract expiration that was written into his contract.

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I get the concept but I just don’t understand the difference between “your contract expires on the 1st but we have exclusive negotiating rights until the 10th” and “your contract expires on the 10th”