The San Francisco 49ers wrapped up the "training camp" portion of the 2015 preseason, and will now open their preseason schedule against the Houston Texans. The team has four preseason games to play, all of which will contribute to the determination of the 53-man roster. Some players are already locked in, others are on the bubble, and some are longshots.
Trent Baalke likely knows what most of the 53-man roster will look like a month from now, but I have to imagine there are several roster spots up for grabs. The four games of the preseason will allow bubble players to climb into or out of the roster, and locks to shuffle around the depth chart.