Horton, a prized offseason free-agent signing, underwent shoulder surgery last summer. He has missed the first 40 games this season.
Bobrovsky, winner of last year's Vezina Trophy as the NHL's top goaltender, has been out since Dec. 3 with a strained groin. He has missed the last 12 games. He is 10-11-2 with a 2.72 goals-against average and a .909 save percentage this season.
Prout has missed the last six games with an upper-body injury.