Draft Scout Snapshot: A closer look at the Dolphins' picks: Round 2/42 - Jonathan Martin, OT, 6-5, 312, Stanford...The Dolphins hoped to fortify the offensive line in this draft and took this three-year starter at left tackle in the second round to do so. The Dolphins will ask him to move to the right side, where he'll compete with Lydon Murtha for the starting right tackle spot. - The Sports Xchange
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09/14/14 - RT Jonathan Martin was beaten twice by Bears backup LDE Willie Young for sacks on QB Colin Kaepernick in Sunday's loss. Martin was making his second consecutive start in place of RT Anthony Davis (hamstring).
09/11/14 - T Jonathan Martin worked out with the first team at right tackle Wednesday and once again appears to be the likely starter this week should Anthony Davis miss a second consecutive game with a hamstring injury.
09/11/14 - T Jonathan Martin has worked out with the first team at right tackle Wednesday and Thursday, and once again appears to be the likely starter this week should Anthony Davis miss a second consecutive game with a hamstring injury.
09/08/14 - OT Jonathan Martin started in place of injured OT Anthony Davis in the season-opening win at Dallas. The Cowboys recorded only one sack in the game.
09/03/14 - T Jonathan Martin has been preparing to replace T Anthony Davis at right tackle should the team's regular starter not be able to play in the opener as he deals with a hamstring problem. Martin, a former Miami Dolphin, will be making his 49ers debut Sunday in Dallas.
08/29/14 - T Jonathan Martin capped an impressive training camp with another strong effort in the preseason finale. He will back up starting tackles T Joe Staley and T Anthony Davis to start the regular season.
07/25/14 - T Jonathan Martin has taken the majority of first-team reps at right tackle in Anthony Davis' stead. Martin had a case of mononucleosis during the offseason program but appears fully healthy and back in shape.
06/12/14 - OL Jonathan Martin returned to practice this week after a three-and-a-half week bout with mononucleosis. The 49ers traded for the Dolphins' former second-round pick this offseason in exchange for a late-round pick in next year's draft.
"(Martin) got off to a good start and the mono hit. Now he's back in there," coach Jim Harbaugh said this week.
The 49ers expect Martin to win the "swing tackle" job behind starters Joe Staley and Anthony Davis. But with left guard Mike Iupati entering a contract year and right guard Alex Boone absent while he hopes to get a new contract, the team is hoping Martin could learn to play guard and potentially be an option in the interior down the road.
"It's a lot of information," said Martin. "It's some new learning. I think, if needed, I'll be able to play."
04/01/14 - T Jonathan Martin was traded by the Dolphins to the 49ers for a conditional 2015 draft pick on March 11.
10/30/13 - RT Jonathan Martin has reportedly left the team and entered a treatment facility after an incident Monday in the team cafeteria in which players jokingly refused to sit with him.
Martin's absence is a complication the Dolphins (3-4) didn't need as they try to end their four-game losing streak against the Cincinnati Bengals (6-2) on Thursday night at Sun Life Stadium.
Fox Sports reported Martin slammed his food tray to the floor and left the cafeteria, and hasn't been seen at the facility since. It's not clear what kind of facility Martin reportedly entered.
Martin, the Dolphins' second-round pick from Stanford in 2012, wasn't at practice Monday or Tuesday. The Dolphins listed his absence as "illness" on the injury report.
The Dolphins didn't have much to say about the reports of Martin's absence.
"Jonathan Martin's status was addressed on the injury report as an illness," said team spokesman Harvey Greene.
Tyson Clabo, who lost his starting job because he'd allowed eight sacks in six games, would likely start at right tackle in Martin's place.
Martin started the season at left tackle, but switched to right tackle last week after the Dolphins, desperate to replace Clabo, traded to acquire Baltimore left tackle Bryant McKinnie.
Martin, who played left tackle in college and has said that's his NFL goal, said last week he'd take the change in stride.
"You can approach this two different ways," he said. "You can go in the tank and be one of those guys who (complains) and moans and is a cancer in the locker room. Or you can be a guy who goes out there and can be a professional, play as hard as I can.
"My mindset is that I'm still going to try better and do whatever I can do help the team win."