The trade deadline is Friday afternoon.
The union was threatening a strike just two weeks ago.
The agreement includes a 5% pay increase, along with workplace safety improvements.
The union's bargaining team says the sides remain "deeply divided."
The Vikings running back is staying in Minnesota.
Cook is due to make $1.3 million this season.
The big man signed a three-year deal with Minnesota.
The NFL's new collective bargaining agreement has stiff penalties for holdouts.
Matthew Coller writes a weekly Vikings column for BMTN, with more of his work found at Purple Insider.