Minnesota Vikings defensive tackle Linval Joseph was shot in the calf by a stray bullet fired in a Minneapolis nightclub Saturday morning.

The Vikings said in a statement that Joseph was an innocent bystander in the incident, which occurred inside 400 Soundbar minutes before closing time. Joseph's injury is minor and he is expected to practice sometime next week. He was treated at a hospital and released Saturday.

The Minneapolis Star Tribune reported that police are looking for a gunman who shot multiple people inside the club.

---Several teams are preparing to approach the San Francisco 49ers about possibly trading for guard Alex Boone, according to ESPN.

Boone has been holding out throughout the offseason for a bigger contract. He and the team are far apart in an extension. It is believed that Boone is prepared to continue his holdout until a new deal is done. He has two years and $4 million left on his contract.

The Tampa Bay Buccaneers and New York Giants are among the teams in need of a guard. Boone can also play tackle.

---The 49ers signed wide receiver Lance Lewis to a two-year deal and waived/injured wide receiver Chuck Jacobs, the team announced Saturday.

Lewis originally signed with the Washington Redskins as an undrafted free agent out of East Carolina in May 2012. He played three games with the Redskins last season before getting released in December. He spent the rest of the season on the Dallas Cowboys' practice squad.

Jacobs was originally signed as an undrafted free agent by the 49ers in May 2013 and spent the season on the practice squad.

---Kansas City Chiefs safety Steve Gregory announced his retirement on Saturday.

Gregory, 31, signed with the Chiefs on July 31. He spent six seasons with the San Diego Chargers and two with the New England Patriots. New England released him on Feb. 28.

Gregory had 386 tackles, seven interceptions and 27 special-teams tackles in 111 NFL regular-season games (54 starts). He also played 11 playoff games (five starts).

---Buffalo Bills left tackle Cordy Glenn was removed from the non-football illness list on Saturday.

Glenn could make his training camp debut on Sunday night. He has been sidelined since June with an undisclosed illness. Rookie Seantrel Henderson started the team's first two exhibition games in place of Glenn.

Glenn has started 29 games in two seasons since he was a second-round draft pick in 2012.

---The Cincinnati Bengals signed free agent quarterback Tyler Wilson on Saturday.

The team added Wilson after backup Jason Campbell injured his throwing arm during Thursday's exhibition loss to the Kansas City Chiefs.

The Bengals are also without A.J. McCarron, who has not participated in training camp because of a shoulder injury.

Wilson, a fourth-round draft pick of the Oakland Raiders in 2013, spent most of the season on the practice squad. He was waived late in the season and spent the rest of the year with the Tennessee Titans.

---The San Diego Chargers signed linebacker Victor Aiyewa on Saturday.

Aiyewa had four tackles in five games with the Green Bay Packers last season.

The Chargers waived linebacker Alvin Scioneaux. If Scioneaux clears waivers, he will be placed on injured reserve. He sustained a knee injury during Thursday's exhibition win over the Dallas Cowboys.

---The Washington Redskins signed free agent safety Da'Mon Cromartie-Smith and waived cornerback Peyton Thompson on Saturday.

The team also announced that defensive end Jason Hatcher passed a physical and was taken off the active/non-football injury list.

Cromartie-Smith entered the NFL as an undrafted free agent in 2010 out of UTEP and spent four seasons with the Pittsburgh Steelers' active roster and practice squad. He played 10 games and has four special teams tackles. Thompson originally joined the Redskins' practice squad in November 2013.