DL Quinton Dial sits out practice, OL Marcus Martin returns for 49ers

SANTA CLARA, Calif. – San Francisco 49ers defensive lineman Quinton Dial, who suffered a back strain in Sunday’s 32-17 loss at Detroit, sat out practice Wednesday, along with inside linebackers NaVorro Bowman, who got his usual Wednesday veteran's day off, and Michael Wilhoite, who has not played since re-injuring an ankle at the Chicago Bears on Dec. 6.

The Niners, did, however, regain the services of second-year offensive lineman Marcus Martin, who sat out last week’s game after suffering a concussion the previous week against the Cincinnati Bengals.

Martin was limited in practice Wednesday.

“What I know is there’s a protocol and it’s across the board,” said coach Jim Tomsula. “So, once somebody says you have a concussion or they’re concerned about a concussion, you go into a protocol and there’s nothing you can do, anybody can do. That protocol is set and until you take all those steps and achieve the levels that you need in all those steps, you don’t play.

“That’s the protocol. ... I don’t know the specifics, but I know that the doctors and the league from the league level down, that’s something they’ve been working on over the past few years.”

Following is the Niners’ injury and practice participation report for Wednesday in advance of Sunday’s season finale against the St. Louis Rams at Levi’s Stadium:

Did not participate: LB NaVorro Bowman (shoulder/finger), DT Quinton Dial (back), LB Michael Wilhoite (ankle)

Limited participation: DT Arik Armstead (shoulder/shin), RT Trent Brown (knee), OL Marcus Martin (concussion), FB Bruce Miller (foot), OL Erik Pears (knee), FS Eric Reid (hip), LT Joe Staley (knee/illness), SS Jaquiski Tartt (knee)

Full participation: CB Tramaine Brock (hamstring), LB Ahmad Brooks (shoulder/back), LB Eli Harold (finger), CB Dontae Johnson (ankle), WR Torrey Smith (back/foot)