Zajac underwent surgery to repair a torn pectoral muscle on Aug. 17. He was expected to be sidelined four to six months.
Lindback has an AHL-leading eight wins to go along with a 2.46 goals-against average and .918 save percentage in 11 games this season for the Admirals. Signed to a one-year contract in the summer, the 29-year-old Swede owns a 45-58-8 mark in 130 career games with the Tampa Bay Lightning, Buffalo Sabres, Dallas Stars, Arizona Coyotes and Predators.
The Florida Panthers signed forward Jonathan Ang to a three-year, entry-level contract, the team announced.
Ang has a team-best 12 goals and 30 points in 21 games with Peterborough of the Ontario Hockey League. The 19-year-old was named the OHL Player of the Week last month after collecting a pair of three-point performances.
The Buffalo Sabres recalled forward Kyle Criscuolo and defenseman Casey Nelson from Rochester of the American Hockey League, the team announced.
In a corresponding move, the Sabres placed defensemen Taylor Fedun and Matt Tennyson on injured reserve.