The 49ers kicked off their Week 2 OTA practice without a host of their veteran players, which is to be expected at this time of the year. Several of them were on the field but either not taking part in the practice sessions or working out on a side field with trainers.
That group includes defensive end Justin Smith (arm) and outside linebacker Aldon Smith (shoulder), both of whom are recovering from offseason surgeries. Pro Bowl offensive linemen Mike Iupati (shoulder) and Joe Staley (knee) also are not taking part. Both had minor arthroscopic surgeries after the season and are expected to be at full speed by training camp.
Staley dealt with his knee issue during the 2012 season and could have played through it again this year but decided to have it taken care of now. The 49ers are looking for a swing offensive tackle, and Staley's absence is allowing the team to get long looks at Kenny Wiggins, rookie Carter Bykowski and others.
Meanwhile, running back Frank Gore and outside linebacker Ahmad Brooks also were working out with trainers and not practicing. It's not known at this point whether they have injuries or are simply allowing younger players to get repetitions at the OTA. ***UPDATE*** Harbaugh said that Gore was "working through something" but that the injury wasn't serious.
Receivers Michael Crabtree (Achilles) and Mario Manningham (ACL) also were absent. Linebacker NaVorro Bowman, cornerback Tarell Brown and center Jonathan Goodwin are not attending this week's voluntary OTA.
The good news: receiver Kyle Williams (ACL) and running back Kendall Hunter (Achilles) were in uniform and taking part in individual drills at the start of practice.
-- Matt Barrows