SANTA CLARA -- The 49ers have acquired a backup center, rookie Nick Easton, in a trade with the Baltimore Ravens, Easton’s agent confirmed this morning. Easton went undrafted out of Harvard in May. The Ravens announced that they obtained a draft pick in return for Easton, but the details have not yet been revealed.
The 49ers are short on centers after expected starter Daniel Kilgore had to have a follow-up procedure in June on the ankle fracture he suffered in October. Kilgore will begin the season on the physically-unable-yo-perform list, meaning he will miss at least the first six games.
Marcus Martin will start the season at center. Dillon Farrell, who appeared in eight games last year for San Francisco, and sixth-round pick Ian Silberman have played center this preseason. So did Joe Looney, but he was waived Friday.
Easton is listed at 6-3, 300 pounds. The scouting service Pro Football Focus ranked him as their highest-rated center of the preseason with a plus-7.7 run-blocking grade and a plus-9.1 grade overall.
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Last month the 49ers traded tight end Asante Cleveland to another AFC team, the Patriots, in exchange for guard Jordan Devey. He is expected to line up at right guard when the 49ers take on the Vikings Sept. 14.
The 49ers and Ravens have been trade partners in the past. San Francisco obtained receiver Anquan Boldin in 2013 for a sixth-round pick.
Meanwhile, the 49ers have reached an injury settlement with linebacker Desmond Bishop, who injured his thumb Aug. 23 against Dallas. That means other teams can sign Bishop immediately. The 49ers can re-sign him after Week 9.
The 49ers acquired Bishop, a San Francisco native, late last season. They placed him on injured reserve earlier in the week when they reduced their roster to 75 players.