Stalberg was injured Tuesday night in the first period of Nashville's preseason game against the Tampa Bay Lightning.
The Predators signed Stalberg to a four-year, $12 million contract during the summer. He won the Stanley Cup with the Chicago Blackhawks last season, scoring 23 points on nine goals and 14 assists in 47 regular season games. He also had three assists in 19 games in the Stanley Cup Playoffs.
Vokoun had been hospitalized since Saturday when he had a procedure performed to dissolve a blood clot in his pelvis.
There is no timetable for him to return to the team.
Vokoun went 13-4-0 with a 2.45 goals-against average in 20 regular season games for the Penguins last season, and went 6-5 with a 2.01 GAA in 11 Stanley Cup Playoff games. He replaced Marc-Andre Fleury as starter for Game 5 of the team's first-round series against the New York Islanders, and backstopped the Penguins to the Eastern Conference Final.
The Edmonton Oilers returned first-round draft pick Darnell Nurse to the Sault Ste. Marie Greyhounds of the Ontario Hockey League and sent three players to the Oklahoma City Barons, their American Hockey League affiliate.
Nurse, an 18-year-old defenseman, was the seventh player taken in the 2013 NHL Draft.
Dallas Stars coach Lindy Ruff revealed after Tuesday's team practice that veteran defenseman Trevor Daley remains out with an upper-body injury and is not likely to be in the team's lineup for their opening-night contest Oct. 3 against the Florida Panthers.
"It looks like Trevor will miss a little bit of time with upper body," Ruff said. "I don't think he'll be able to start the season, but it won't be a long time."
Theodore, taken by the Ducks with the 26th pick of the draft, has one assist and four shots on goal in three preseason games.
The 6-foot-2, 178-pound defenseman had 19 goals and 31 assists in 71 games last season with his junior team, the Seattle Thunderbirds of the Western Hockey League. He also had five assists in seven games to help Canada win the gold medal at the 2013 IIHF World Under-18 Championship.
New Jersey Devils forward Jaromir Jagr returned to practice Tuesday for the first time since the opening of training camp on Sept. 12 after nursing a lower-body injury.
"Back and hip muscles, they're all connected," Jagr said. "I'm glad I didn't get injured again. I guess that's the first step. I knew it wasn't good when it happened to me in the first practice. It probably had something to do with the plane ride. Traveling 15 hours is not easy."
Brunner was invited to Devils training camp on a professional tryout and had two assists playing on a line with Patrik Elias and Jacob Josefson in the Devils' preseason win against the New York Islanders last Saturday at Barclays Center in Brooklyn.
"He came to camp without a contract and showed us what he can do," Devils general manager Lou Lamoriello said.