Dallas Cowboys running back Dalvin Cook appears in line to make his season debut against the San Francisco 49ers on Sunday night in Santa Clara, Calif.Cowboys coach Mike McCarthy noted the four-time Pro Bowl selection is now up to speed after the latter signed with the team’s practice squad on Aug. 28.”Dalvin is ready,” McCarthy said on Friday. “I really like the work that he’s putting in. I think he’s clearly crossed over the threshold of the communication and the understanding (of the offense).”Dallas (3-3) certainly could use the boost, as it ranks last in the NFL in rushing yards per game (77.2).While Cook could be on the field Sunday for the Cowboys, the team ruled out star edge rusher Micah Parsons (ankle) and cornerback DaRon Bland (foot) for the game against the 49ers (3-4).Parsons has missed the past two games while Bland has yet to play this season.