Dadonov, acquired in a trade with the Ottawa Senators on July 28, scored 13 goals in 55 games last season. He scored between 25-28 goals each of the previous three seasons with the Florida Panthers.
Janmark, acquired in a trade with the Blackhawks on April 12 and signed to a one-year contract July 28, scored 24 points (11 goals, 13 assists) in 56 games last season, including five points (one goal, four assists) in 15 games for Vegas. He scored eight points (four goals, four assists) in the playoffs.
The Golden Knights need scoring depth, especially while forward Alex Tuch misses the start of the season recovering from shoulder surgery.