Although the majority of the team has been in over the last several weeks for the team's voluntary off-season strength and conditioning program, all players are expected to report for this weekend's mandatory mini camp - including the 49ers rookie class.
Players will undergo physicals and take their new mug shots on Thursday and then report early Friday morning for the official kickoff of the three-day camp.
Two practices are scheduled for Friday and Saturday with one practice set for Sunday.
Guard David Baas had surgery last week to repair a torn pectoral muscle and has been ruled out of the mini camp.
Defensive tackle Joe Cohen and linebacker Manny Lawson are also being held out of the camp as a precautionary measure after ACL injuries in 2007. Both players have been active in the team's off-season program.
Quarterback Alex Smith is expected to have his snaps monitored over the weekend. He and quarterback Shaun Hill will alternate snaps with the first unit.
Following the mini camp and due to NFL rules, 49ers rookies will not be allowed to join the off-season conditioning until either May 16 or following the date of graduation at their respective universities. The rule was put in place to encourage athletes to finish school.