Tim Twentyman, a Detroit Lions writer and insider, reports that the Lions have decided to keep running back Jahvid Best on the Reserve/PUP list.

The Lions have made the decision to keep RB Jahvid Best on the Reserve/PUP list, ending his season.

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Tim Twentyman (@ttwentyman) November 02, 2012

Best started the season on the PUP list, making him ineligible until Week 6, at which time he was not cleared by a team of independent doctors to play.

Best has not played since the Week 6 game against the 49ers in 2011, when he suffered a concussion.

Martin Mayhew released the following statement regarding the Lions’ decision:

There has been subsequent evaluation and consultation regarding Jahvid since our last update (October 15). As has been the case throughout, we have deferred to the medical experts and support their current recommendation that Jahvid not return to the field this season.

With Best out for all of 2012 and most of 2011, the question is whether this decision ends Best’s season or his career.

And now the question: Season or career?

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Chris Burke (@ChrisBurke_SI) November 02, 2012

Lions running back Jahvid Best will not be permitted to play because of concussions. (Leon Halip/Getty Images)

Detroit Lions running back Jahvid Best will not be permitted to return to play after having suffered multiple brain injuries in the past two seasons, the team announced Monday.

Best hasn’t played since suffering a concussion last Oct. 16 against the San Francisco 49ers. He also suffered a concussion in a preseason game earlier that season.

Best was eligible to come off the physically unable to perform list today on Monday and had hoped to make his debut in next Monday night’s game against the Chicago Bears.

“After today’s consultation with medical experts, including representatives from our medical and training staffs, it has been determined that Jahvid will not be permitted to return to play at this time,” Lions general manager Martin Mayhew said in a statement.

Best has 945 yards rushing and six touchdowns in two seasons with the team. Mayhew said that Best will continue to work with medical and training staffs in hopes that he can make a return to the field.

“The situation I’m in with the way that concussions are being taken right now, it’s taking a long time [to be cleared for contact],” Best said last week. “I guess I’m just kind of the poster boy for [the new concussion protocols], and I have to take it how it is.”

Jahvid Best may be cleared to return to the Lions on Friday after suffering two concussions last season. (Leon Halip/Getty Images)

Lions running back Jahvid Best will find out if he’s cleared to return to football on Friday, according to a report from the Detroit Free Press on Thursday afternoon. Best suffered two concussions last year and has not played since Oct. 16, 2011. He went through several neurological evaluations earlier in the week.

“When you take the concussion test, it’s a lot of stuff that goes on,” Best said. “I took it Monday, and so they don’t know how it went until Friday. It’s a lot of, I don’t know if you’d call it grading or not, but there’s a lot of stuff that goes on, so I can’t give you my opinion on how it went. But I’m just hopeful for the best… I know I can get back out there and make a difference.”

Lions coach Jim Schwartz said a team of outside specialists across the country have been consulted during the latest round of tests rather than team trainers.

“That’s a sign of the times, and I think it’s good that way,” Schwartz said. “Hopefully, we get good news, and when he’s eligible to come off PUP [physically unable to perform], he’s able to do that. But we can’t force that issue, we can’t have anything to do with that issue.”

If he is cleared to play, Best could be activated for the team’s Monday night game against the Bears on Oct. 22 or start a 21-day practice window. Before the injury, Best accumulated 390 rushing yards and three total touchdowns in six games.

Lions running back Jahvid Best is still not able to participate because of lingering concussion issues. (Leon Halip/Getty Images)

Detroit Lions running back Jahvid Best continues to work his way back from a brain injury, but if he is not healthy he may end up on the physically unable to perform list.

Best has not played in a game since Oct. 16, when he suffered his second concussion of the year in a loss to the San Francisco 49ers.

If Best starts the season on PUP, he will be required to miss at least the first six weeks and after that he can be activated. The earliest Best could play would be Oct. 22. The Lions play the Chicago Bears on Monday night.

“Particularly with concussions, time is always beneficial,” Lions head coach Jim Schwartz told the Detroit Free Press. “We’ve seen that with a lot of other guys that have come back and that would buy us time if we had to cross that hurdle.He’s working out hard, he’s just not cleared (for contact) yet.”

Lions currently have running backs Kevin Smith, Keiland Williams and Joique Bell on the roster. Mikel Leshoure, who did not play last season with a torn Achilles, has battled a hamstring injury this preseason.

Detroit Lions running back Javhid Best has been cleared for contact in June, according to the team’s official site.

 “He’s been doing everything in the offseason program and we expect he’ll be cleared sometime probably in June,” Lions general manager Martin Mayhew told Mike O’Hara and Ken Brown on WJR Monday night. “We look forward to having him on the field.”

“Those doctors felt like it just made sense to do that in June,” Mayhew said. “It gives him the most time. “We are not doing anything that involves any contact and he’s been cleared to do everything that we’re doing right now and he’ll be officially cleared for contact in June.”

Best missed the final 10 games of the Lions regular season after suffering a concussion in a 19-25 Week 6 loss to the San Francisco 49ers. The 23-year-old suffered through post-concussion symptoms through the remainder of the year, it was reported that some close to him urged him to consider retirement.

The concussion was Best’s second of the year, the 23-year old had previously suffered one after a blow to the head in the NFL’s shortened pre-season. The versatile back also had a history of concussions during his college career at the University of California.

Detroit Lions running back Jahvid Best was cleared to resume workouts today, according to ESPN’s Adam Schefter.

Lions RB Jahvid Best, who missed much of last season after suffering another concussion, was cleared to resume workouts. More at espn.com.

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Adam Schefter (@AdamSchefter) March 07, 2012

Best missed the final 10 games of the Lions regular season after suffering a concussion in a 19-25 Week 6 loss to the San Francisco 49ers. The 23-year-old suffered through post-concussion symptoms through the remainder of the year, it was reported that some close to him urged him to consider retirement.

The concussion was Best’s second of the year, the 23-year old had previously suffered one after a blow to the head in the NFL’s shortened pre-season. The versatile back also had a history of concussions during his college career at the University of California.

Detroit Lions running back Jahvid Best is likely out for Sunday’s game against the Chicago Bears, according to ESPN.com. Best is recovering from a concussion sustained in the Lions’ Week 6 loss to San Francisco.

Best is scheduled to meet with doctors this week and will undergo further testing, according to ESPN.

In Best’s absence, the Lions have used Maurice Morris and Keiland Williams, who have rushed for a combined 177 yards and one touchdown.

Before his concussion, Best had rushed 84 times for 390 yards and two touchdowns this season and had caught 27 passes for 287 yards and one touchdown.