Cornerbacks A.J. Jefferson and Xavier Rhodes and free-agent linebacker Desmond Bishop all returned to practice Sunday afternoon after missing time with hamstring injuries. Defensive tackle Christian Ballard (groin) and linebacker Audie Cole (ankle) did not practice. Frazier said cornerback Jacob Lacey will undergo arthroscopic surgery on his knee and likely be out 2-4 weeks. ... Backup center Joe Berger returned to camp after missing a few days last week because of a death in the family. ... Former Minnesota State receivers LaMark Brown and Adam Thielen both had impressive afternoon practices, with each catching several passes in team drills, including at least one long reception.