On Sunday in an exhibition against the San Diego Chargers, Martin suffered a dislocated kneecap during the fourth quarter on a running play. There was a collision with Ryan Seymour in the midst of a ground play to Glenn Winston.
Martin was a third-round pick of the 49ers in the 2014 NFL Draft. He was expected to bring in competition for Daniel Kilgore for the starting center job to replace Jonathan Goodwin, who was the starter from 2011-2013.
Other 49ers on the depth chart who can play at center include Ryan Seymour, Adam Snyder and rookie Dillion Farrell. The 49ers can either place him on the injured reserve-designated for return (IR-designated for return) or have him on the 53-man roster.
Every week, all NFL teams need to sit seven inactive players on their 53-man roster with only 46 of them suiting up for the game. Martin could remain inactive each week on the 53-man roster as he recovers from his injury.
Glenn Dorsey appears to be the candidate for the IR-designated for return list and it can only be used on one player. He would not count against the 53-man roster as he recovers from a bicep injury.