Smith was listed as having a head injury on the team's injury report, but coach Eric Mangini wouldn't go into details.
"No real update on Brad Smith," Mangini said before practice. "We'll monitor him throughout the week here and see where he is at the end of the week."
Mangini added that Smith, a former college quarterback who has 10 catches for 68 yards and 11 carries for 116 yards in his third season, would only do "some light things" at practice.
Smith caught a 7-yard pass across the middle with 2:14 left and was simultaneously grabbed from behind by Michael Lewis and slammed into by Patrick Willis, with the 49ers linebacker's shoulder and then his helmet appearing to strike Smith's helmet.
Smith's body bent backward on top of Lewis, the wide receiver appearing stunned. Smith then quickly popped up and walked a few yards before getting woozy and going down on one knee.
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