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Rashean Mathis wasn't diagnosed with a concussion, but was withheld from Sunday's win against Chicago anyway. (Associated Press)

ALLEN PARK -- Rashean Mathis was held out for the final three quarters of the Detroit Lions' 40-32 win Sunday against the Chicago Bears, despite passing two concussion tests.

Coach Jim Schwartz affirmed that point Monday, but cleared up some confusion as to who exactly kept Mathis off the field after he took a first-quarter blow to the head while trying to tackle Matt Forte.

Schwartz said Detroit doctors made the final call to hold out Mathis, not Chicago's doctors, as Mathis had told MLive and other outlets after the game.

"That's always our doctors' decision, but our doctors are going to take in every bit of information that they can," Schwartz said. "They have to weigh all that. Plus the tests on the sideline and all that stuff."

The Bears' medical staff was first to respond to Mathis on the field and said they believed the safety lost consciousness. That was enough for Detroit (3-1) to keep Mathis on the sideline, even though he passed the tests.

"I think we're pretty well documented as being one of the most conservative teams in the league when it comes to concussions," Schwartz said. "Quite honestly, there might have been some teams that would have cleared Rashean to go back in the game. But we erred on the side of caution in that case. He was helpful on the sidelines, stayed there through the end of the game. He was working with (replacement Darius) Slay when Slay came off the field.

"If you're concussed, that's not a situation you can do (that). But again, our guys are going to take all the information that comes in -- including how he felt last night and how he felt today."

Mathis said he felt fine during the game, and doesn't believe he lost consciousness. He was frustrated to be sidelined, despite passing his tests, but the win helped.

Schwartz said Mathis worked out Monday and showed no symptoms of a concussion. Barring a setback, Mathis would seem a good bet to play next Sunday against the Green Bay Packers (1-2).

"We feel pretty good about where he is right now," he said. "We'll see how it goes the rest of this week."

That's good news for Detroit, which also lost its other starting corner. Chris Houston left the game in the second half with a leg injury, and Schwartz wasn't as optimistic about his outlook.

"At this point it doesn't appear as though it's more than day-to-day, week-to-week," he said. "But we will see."