Devey, 27, is an undrafted free agent who spent time on the team's practice squad before starting four games for the Super Bowl champions last season. He has worked at both center and guard, giving him value to a Niners team looking for some stability on the right side of its line.
Cleveland, 23, was one of eight tight ends in camp for the 49ers. The University of Miami product signed with the 49ers as an undrafted free agent in 2014 and appeared in six games for the team that year. He has yet to catch a pass in a regular-season game, but had three catches for 10 yards in the Niners' preseason opener against the Texans.