Pickard was selected by Vegas from the Colorado Avalanche in the NHL Expansion Draft on June 21 and was expected to be the No. 2 goalie behind Marc-Andre Fleury. But Pickard was waived Thursday after the Golden Knights clamed goalie Malcolm Subban off waivers from the Boston Bruins on Tuesday.
Subban is expected to back up Fleury. The 23-year-old is 0-2-0 and has allowed six goals on 22 shots in two NHL games.
Pickard, 25, was 15-31-2 with a 2.98 goals-against average and .904 save percentage in 50 games (48 starts) with the Avalanche last season. He could compete with Curtis McElhinney to be the backup in Toronto behind Frederik Andersen.
Lindberg, 22, has two assists in six NHL games with the Maple Leafs in 2015-16.