Kyler Murray was well enough to join the Minnesota Vikings for practice on a limited basis to leave open the possibility he could progress through the NFL concussion protocol to play this week at Chicago. The Vikings will be without leading rusher Jordan Mason for at least four weeks with a broken thumb he suffered in the season opener. Murray left that game against Green Bay after an illegal hit to the head at the end of a run. The Vikings prefer to decide their quarterback by Friday. Carson Wentz would play if Murray is not medically cleared in time.