Sidelined since October,Adidas Scarpe Nuove, Cobb was given extra work Friday to determine how he would feel Saturday, when the Packers could decide to activate him.
Green Bay knows it will already be without pass-rushing linebacker Clay Matthews, who had surgery this week after re-aggravating a right thumb injury. There's no timeline for his return, and it appears highly unlikely that Matthews would be available for a first-round playoff game the weekend of Jan. 4 should the Packers beat Chicago on Sunday to win the NFC North.