Running back Carlos Hyde officially got ruled out and three other starters, including wide receiver Torrey Smith, are questionable to play Sunday when the 49ers host the Tampa Bay Buccaneers.

Hyde’s workload likely will be shared by Shaun Draughn and Mike Davis, with DuJuan Harris possibly being promoted from the practice squad Saturday.

Smith, who’s never missed a game in his six-year career, was limited by a back issue Friday for the second straight practice.

Cornerback Rashard Robinson has yet to gain full medical clearance after Sunday’s concussion in Buffalo, but he practiced again in a limited fashion Friday. Robinson is questionable, as is defensive tackle Glenn Dorsey (knee).

The Buccaneers (2-3) declared out running back Doug Martin (hamstring) and defensive linemen Robert Ayers (ankle) and Clinton McDonald (hamstring).

Defensive tackle Gerald McCoy (calf) is questionable to return to the lineup, and also quesitonable are wide receiver Cecil Shorts (hamstring), cornerback Jude Adjei-Barimah, center Joe Hawley and tight end Luke Stocker (ankle).

An unspecified illness kept kicker Phil Dawson from practicing Friday but he’s expected to play Sunday. Dawson and Hyde were the only 49ers who didn’t practice Friday, and Hyde expects to return from his right-shoulder injury after next week’s bye.

Defensive backs Jimmie Ward and Jaquiski Tartt look on track to returning from quadricep injuries, and both practiced in full Friday.

Quarterback Blaine Gabbert was a full participant in the past two practices despite a recently disclosed back issue. Coach Chip Kelly has said Gabbert will serve as Colin Kaepernick’s backup for a second straight game; No. 3 quarterback Christian Ponder has been inactive every game.

Others battling injuries but slated to play are defensive tackles DeForest Buckner (foot), Arik Armstead (shoulder) and Quinton Dial (knee); guards Zane Beadles (ankle) and Joshua Garnett (foot); tight end Vance McDonald (hip) and wide receiver Jeremy Kerley (ankle).

— Buccaneers coach Dirk Koetter had an up-close view of the 2012 49ers’ NFC Championship win, a 28-24 triumph at Atlanta. Koetter was the Falcons’ offensive coordinator. “We had a big lead and in the second half they came back,” Koetter told Tampa-area reporters this week. “Some unfortunate plays, crazy string of events on that last drive.”

After the 49ers took the lead, the Falcons reached the 49ers’ 10-yard line before Matt Ryan’s final two passes fell incomplete on that series.

“To be that close to the Super Bowl and not make it – coaches always remember losses more than wins and that’s one. … It was hard to watch them play in the Super Bowl, but they did have a really good football team.”

Buccaneers defensive coordinator Mike Smith was the Falcons head coach from 2008-14.

Koetter interviewed in January for the 49ers opening before the Buccaneers elevated from offensive coordinator to succeed Lovie Smith. Koetter, in a conference call with Bay Area media this week, declined to discuss his 49ers courtship, stating: “None of that matters at this point.”