It appears one of the question marks on the 49ers’ offensive line has been answered: right tackle Anthony Davis was not on the field at the start of practice today, making it likely that Jonathan Martin will start in his place Sunday at Dallas.

Davis (hamstring) has not practiced this week and it’s rare for a player to suit up for a game after they’ve been sidelined during the week. The 49ers will release an injury report – with players’ status for the game – this afternoon.

Martin, who left the Dolphins last year in the midst of a bullying scandal, last played in a regular-season game when he started in Miami’s 27-17 loss at New England on Oct. 27, 2013.

Meanwhile, Jim Harbaugh and offensive coordinator Greg Roman have been coy about Alex Boone’s status for Sunday after the right guard ended his contract holdout by reporting to the team Monday.

The questions: Is Boone in adequate physical condition and can he pick any tweaks to the playbook after missing the entire offseason?

On Thursday, left tackle Joe Staley suggested those wouldn’t be issues for Boone, who has started the past 37 games, including the playoffs. The 49ers have had a roster exemption for Boone, who must be added to the 53-man roster before he can play in a game.

“Boone looks great,” Staley said. “He’s worked real hard this offseason. He looks great and, mentally, he’s one of the smartest guys I’ve ever been around. But that’s a decision up to coaches.”

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Defensive tackle Ray McDonald was prompt today. McDonald, who is being investigated for suspicion of felony domestic violence, had arrived late to the previous two practices.

The 49ers have not announced whether McDonald will play Sunday. Harbaugh will have his press conference around 12:30 p.m. today.

Cornerback Chris Culliver (ankle) and tight end Vance McDonald (hamstring) were practicing after they appeared on the injury report Thursday.