SANTA CLARA -- Tight end Vernon Davis, who continues to go through the NFL-mandated protocol in order to gain clearance to return from a concussion, is not expected to practice Wednesday, 49ers coach Jim Harbaugh said.
Davis sustained a concussion in the first quarter of the 49ers' 42-13 loss Sunday night when Seattle Seahawks safety Kam Chanceller hit him high while breaking up a pass. Chancellor was penalized for unnecessary roughness.
Davis must first receive clearance from an independent neurologist before he can return to practice. Harbaugh said Davis has not experienced a setback. Davis appeared on the practice field Wednesday and took part in individual stretching.
Meanwhile, the 49ers figure to promote receiver Ricardo Lockette or Chad Hall from the practice squad to fill the vacancy left by Mario Manningham's season-ending knee injury. Harbaugh suggested the 49ers could also fill the final roster spot with a practice squad player at another position.
The 49ers have no intention of looking outside the organization to a veteran player to fill the roster spot, Harbaugh said.
Harbaugh suggested that there will be competition among the wide receivers in practices this week to determine which player suits Sunday, along with Michael Crabtree, Randy Moss and Ted Ginn, the punt-return specialist.
"A.J. (Jenkins) will step up," Harbaugh said of the 49ers' first-round draft pick. "We'll look at a couple of other options at receiver, but that group will have to step up."
Defensive tackle Justin Smith, who missed the 49ers' past six quarters of action, continues to rehab his left arm/elbow, Harbaugh said. His availability for Sunday's season finale against the Arizona Cardinals remains in question.
The Buffalo Bills have signed two 49ers free agents within the past two days.
After signing wide receiver Rod Streater on Wednesday, the Bills announced the signing of linebacker Gerald Hodges on Thursday.
The 49ers acquired Hodges in a 2015 trade with the Minnesota Vikings for center Nick Easton and a sixth-round draft pick. Hodges started 12 games last season and ranked second on the team with 92 tackles.
Hodges left the 49ers shorthanded for a late-season game against the Atlanta Falcons when he violated team rules. Then-coach Chip Kelly did not disclose the nature of Hodges infraction. Hodges offered no explanation or apology.
The 49ers entered the game against the high-powered Falcons with just two healthy inside linebackers due to Hodges’ deactivation. Starter Nick Bellore sustained an elbow injury on the third play of the game, and the 49ers were forced to use safeties Antoine Bethea and Vinnie Sunseri, and outside linebacker Ahmad Brooks at various points of the game.
The 49ers showed no interest in re-signing Hodges as a free agent.
Streater, a five-year NFL veteran, saw action in all 16 games last season after being acquired in a trade with the Kansas City Chiefs in September. He caught 18 passes for 191 yards and two touchdowns.
It was Jim Harbaugh's first season as head coach of the 49ers.
The 4-1 49ers were in Detroit and scored 10 points in the final 5:29 to beat the Lions 25-19.
An excited Harbaugh got a little too agressive during his postgame handshake with Lions coach Jim Schwartz. The two had words for each other and had to be separated.
Six years later, Harbaugh took the blame for what happened and said that he and Schwartz have patched things up.
"I went in too hard on that, too aggressive on the handshake. I've since changed that. Not doing that anymore. Can't blame him. I went in too hard. And you respect him for taking exception. We've talked, and we're good. We're back to friends. There is a protocol in a postgame handshake. I've been there as the winner. I've been there as loser. You just, 'Hey, nice game,' then go celebrate. Premature celebration there, in the wrong," Harbaugh said Tuesday on Barstool Sports' Pardon My Take podcast.
Harbaugh sounds like he's learned his lesson from that incident with Schwartz.
"The postgame handshake isn't the place for anything. If you're bitter, than change the I to an E. Don't get bitter, get better. Nothing's really changing at the postgame handshake. Just professionally shake hands and go on your way," Harbaugh said.
Harbaugh moved on from the 49ers to coach the Michigan Wolverines. Schwartz coached the Lions through the 2013 season and currently serves as the defensive coordinator for the Eagles.