Tight end Jordan Reed carries the ball for a first down during the second quarter against the Cleveland Browns on Oct. 2. (Photo by Ricky Carioti/The Washington Post)

Redskins tight end Jordan Reed has been ruled out for Sunday’s contest against the Detroit Lions because of a concussion. It’s the second consecutive game he will miss from the injury he suffered Oct. 9 against the Baltimore Ravens.

Reed missed his second consecutive practice on Friday despite being a limited participant on Wednesday. He wore a yellow non-contact jersey in what appeared to be a positive sign at the time, but the fourth-year veteran’s status did not improve from there.

“I don’t think he had a setback,” Redskins Coach Jay Gruden said. “I just think they didn’t really clear him. That’s all. That’s all I can say. I don’t even try to argue or ask why, I just [ask] if he’s cleared or not and the answer is no. So hopefully we’ll get him back next week.”

Reed has now missed four games over the last two seasons because of a concussion. This is Reed’s fifth diagnosed concussion, and at least the sixth one he’s had in his playing career. The Redskins will once again rely on Vernon Davis and Niles Paul in Reed’s absence. Davis recorded two catches for 50 yards and his first touchdown of the season in last Sunday’s victory over the Philadelphia Eagles.

“I think [Davis] did great,” offensive coordinator Sean McVay said. “Vernon is a pro. You could see why he has been an all-pro player in his career, and I thought he stepped up and did an excellent job with the opportunities that he had.”

Meanwhile, wide receiver DeSean Jackson will be questionable because of a shoulder issue. He practiced for the first time on Friday and said he expects to play. Jackson rested on Wednesday and Thursday because of soreness in his shoulder.

“He ran around pretty good,” Gruden said. ‘I don’t want to put a percentage on it. We’ll have to wait to see how he does tomorrow, see how much range of motion he has and if he’s good. But he said he felt a lot better today, so that’s a good thing.”

Rookie linebacker Su’a Cravens was a full participant for the second consecutive practice, and Gruden said “he’s good to go” after missing the last two games because of a concussion. Cravens said he’s still waiting for the league approval for his visor as a result of his concussion. He’s continuing to wear glasses as well, but Cravens said he could wear contacts during the game if his dark visor isn’t approved in time.

“It’s just stressful because I hate missing games,” Cravens said. “Seeing my teammates out there grinding together, it hurts me. Inside, it hurts me. It really bothers me. I’m trying to get back as soon as I can.

“All my friends told me, ‘Hey, you got a concussion, but you got a visor out of it.’ So I’m like, ‘Yeah, maybe. Maybe.’”