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According to Lions head trainer Kevin Bastin, Mathis was checked for a concussion late in the Vikings game, was cleared, then began showing symptoms after the team traveled to London.
Before taking questions, Jim Caldwell began his news conference with an unusually long preamble, talking about his relationship with two of his bosses who were fired last week.
The Detroit Lions were last on the field and destroyed by the Kansas City Chiefs in London. Now, they're coming off of a bye week where their front office was shaken up and they still have just one win.
She was "passionate," according to running back Joique Bell, and "letting us know what was going on," according to defensive end Darryl Tapp.
"I understand from Bill that there was a quote out there that said I was like a dead man walking, but as you can see, I'm alive and well."
Lions head coach Jim Caldwell said it was "hogwash" that the team was frustrated with Matthew Stafford's intelligence.
The Detroit Lions have a talented team that returned a lot of players from last year's playoff squad, but this season simply has brought as much success. While some of the veterans are faltering, the future for the Lions looks bright with some rising stars.
My NFL picks are heating up, helping you win your pick-em-pool, embarrass your friends, and just become a more whole football fan and human being.
It's not clear yet whether Detroit will begin a total rebuild, but the front office shake-up underscored just how far the Lions have fallen this season.
CBS Sports NFL Insider Jason La Canfora spoke to Brandon Tierney and Tiki Barber on CBS Sports Radio on Friday about everything from who's actually running the team to what the chances of trading Matthew Stafford are.
The Detroit Lions being 1-7 and the worst team in the NFL, record wise, is not something that will just be taken lying down. That's why the team has fired general manager Martin Mayhew and president Tom Lewand in hopes of getting things turned around.
"Personally I'm sick and tired of total revamps of this organization. I'm not interested in seeing a total rebuild."
Lions backup QB Dan Orlovsky took to his Twitter account to challenge Rapoport's attack on Matthew's ability to understand the offensive scheme.
"You guys will see soon — I'll give more details later..."
And according to NFL Network's Ian Rapoport, Stafford's status with the franchise is in jeopardy.
Olivia Olson had all 27 of her points in the second half and Syla Swords bounced back from a slow start to score 26 and help second-seeded Michigan rout short-handed N.C. State.
Western Michigan has hired Kahil Fennell away from Texas-Rio Grande Valley to be its men's basketball coach.
Kim Barnes Arico has turned Michigan's women's basketball into a consistently winning program for the first time in school history.
Michigan State has advanced to the Sweet 16 for the 17th time under coach Tom Izzo, beating Louisville 77-69 on in the second round of the NCAA Tournament.
Yaxel Lendeborg punctuated his 25-point outing with a massive dunk in transition, and the Midwest Region's top-seeded Michigan advanced to the Sweet 16 with a 95-72 win over Saint Louis in the second round of the NCAA Tournament.
Unleaded gasoline and diesel fuels were mixed in error at a Meijer Express fuel station in Macomb County, Michigan, the supermarket chain said Saturday.
As the partial government shutdown continues, some Transportation Security Administration workers across the U.S. have called out over missed paychecks.
President Trump said Immigration and Customs Enforcement agents will assist TSA agents at airports as delays and security staffing shortages continue to worsen.
It's a sign that Metro Detroiters are ready to say goodbye to winter and welcome spring, and the Marche du Nain Rouge is a feast for the eyes.
A California man is accused of taking part in a large-scale gift card fraud scheme that targeted several Southeast Michigan Meijer stores.
Cities in Michigan lose big tax revenue from pollution-control tax breaks, and many do not track what they give up.
Gas prices are currently hovering just below $4 a gallon in much of Michgan, AAA says.
Henry Ford introduced the moving assembly line, a system that reshaped industrial production and helped make automobiles more accessible to the public.
A $4.3 billion investment is going toward a battery cell manufacturing plant in Lansing, Michigan, to provide Tesla with prismatic battery cells.
The United Auto Workers says that Detroit Diesel is adding a third shift, recalling laid-off workers and hiring dozens more people.
It's a sign that Metro Detroiters are ready to say goodbye to winter and welcome spring, and the Marche du Nain Rouge is a feast for the eyes.
Chuck Norris' family said his death at 86 was sudden, but did not share any details on the cause.
Afroman spoke to CBS News after he won the case, which tested the limits of parody and the license artists can take in social commentary directed at public figures.
Short film director Sam Davis gave a shout out to his Michigan hometown when accepting an Oscar award on Sunday.
The film follows CBS News correspondent Steve Hartman and photographer Lou Bopp through their seven-year journey to document the toll of America's school shooting epidemic.
President Trump said Immigration and Customs Enforcement agents will assist TSA agents at airports as delays and security staffing shortages continue to worsen.
TSA representatives say employees are trying to figure out how to feed their families and keep the lights on at home.
Police found that five Barbie packages containing fentanyl were sold. They have all been recovered.
Most Republicans, especially MAGA, continue to support the US action and express a lot of confidence in Trump personally.
The Supreme Court will consider whether states can count mail ballots that are postmarked by Election Day but arrive after.
A measles outbreak continues to expand in Southeast Michigan, with a fourth suspected case now reported in Washtenaw County.
Michigan health officials have identified a measles outbreak in Washtenaw County after three linked cases were reported since March 12.
Legislation is pending in Lansing that is intended to prohibit the sale or distribution of a substance called kratom.
A new report says Michigan should invest in primary care doctors to ease a severe shortage of physicians that has led to long wait times, higher costs and missed care.
The vote from 10,000 nurses at nine hospitals and campuses received 90% approval for authorization
Olivia Olson had all 27 of her points in the second half and Syla Swords bounced back from a slow start to score 26 and help second-seeded Michigan rout short-handed N.C. State.
Western Michigan has hired Kahil Fennell away from Texas-Rio Grande Valley to be its men's basketball coach.
Kim Barnes Arico has turned Michigan's women's basketball into a consistently winning program for the first time in school history.
Michigan State has advanced to the Sweet 16 for the 17th time under coach Tom Izzo, beating Louisville 77-69 on in the second round of the NCAA Tournament.
Yaxel Lendeborg punctuated his 25-point outing with a massive dunk in transition, and the Midwest Region's top-seeded Michigan advanced to the Sweet 16 with a 95-72 win over Saint Louis in the second round of the NCAA Tournament.
Dave Coulter updates Oakland County's move to its new offices in downtown Pontiac and when that might take place.
Gardner White opened doors in Detroit in 1912, and the retailer continues to expand with nine new stores planned this year.
Rose talks about a new TV series being filmed in Detroit called "South West High," which revolves around a fictional high school in the Motor City.
As Women's History Month kicks off, Donna Murray-Brown, the new president and CEO of Inforum, appears on Michigan Matters.
Penske, a business and racing legend, turns 89 on Feb. 20 and is celebrating his 60th year in racing during 2026.
A colder, but drier, start to the work week
Prime Minister Benjamin Netanyahu is calling on the international community to join Israel and the U.S. in the war against Iran. Cristian Benavides reports.
Detroit's popular Marche du Nain Rouge returned to the Cass Corridor earlier on Sunday.
President Trump said Immigration and Customs Enforcement agents will assist TSA agents at airports as delays and security staffing shortages continue.
TSA representatives tell CBS News Detroit employees are trying to figure out how to feed their families and keep the lights on at home.
