Add a backup goaltender to the Predators’ offseason wish list. That’s what general manager David Poile indicated Monday following a news conference in Antioch to announce new twin ice rinks at the former Hickory Hollow Mall. The Predators “might, maybe and in all probability will be looking to see what’s available” among backup goaltenders when free agency begins July 5, Poile said. The decision has been relayed to Chris Mason, who backed up Pekka Rinne last season. The Predators signed the 37-year-old Mason to a one-year, $1.25 million contract last summer. It was his third tour of duty with the team as well as the most challenging. He finished with a 3.73 goals against average, .873 save percentage and 1-7-1 record in 11 total appearances during the 48-game, lockout-shortened season. “It didn’t work out the way we had scripted it when he signed,” Poile said. “First of all, we scripted an 82-game schedule with lots of opportunities to play. Then we get into a 48-game schedule, Pekka gets all the games we thought would be designated to Chris, and we had nothing to show for it. We really put him in a bad position and he was unable to do his thing.” This summer’s free agent backup class isn’t considered a bumper crop, though former Predator Dan Ellis is the one name that sticks out. Ellis, 32, posted a 3.13 goals against average and .906 save percentage for the Carolina Hurricanes last season. He also could come relatively cheap. The Predators could also look within their own system to 22-year-old Magnus Hellberg. The 6-foot-5 Swede, a second-round pick in 2011, posted a 2.14 goals against average and .924 save percentage last season with the Milwaukee Admirals in the American Hockey League. “That’s another thing we’re talking about within our organization too, is whether he’s had enough experience yet,” Poile said. “I think our druthers would be to see him play another full year down there (in Milwaukee) in terms of his development.”