By Patrick Andres With the NFC playoff race rapidly tightening, the Vikings are set to get a key weapon back in their quest for a second straight postseason berth. Minnesota wide receiver Justin Jefferson was not listed on the injury report Friday and is set to return Sunday against the Raiders. Jefferson was a full participant in practice all week. Jefferson has not played since sustaining a hamstring injury Oct. 8 against the Chiefs. The Vikings are 5-2 in seven games without their offensive star. “I don’t see any restrictions as far as his ability to go out there and function and play. He f…