Matt Duchene and Bobby Ryan were put on an early reserve by the Ottawa saddlers.
The attacks were injured in a 5-2 loss in Montreal Canadian on Thursday. Duchene suffered a trauma during the second period and is week to week; Ryan left in the first period with a concussion and no schedule for his return.
Duchene entered on Saturday for the ninth in the NHL with 34 points (12 goals, 22 assists), 13 behind the leader Miko Rantenen Colorado Avalanche.
Duchene played 82 games last season for Otava (68) and Colorado (14) and missed 23 matches from the 2012-13 season.
Ryan has 18 points (six goals, 12 assists) in 29 games this season.
Senators on Friday recalled that Nick Paul of Belleville from the American Hockey League. He had one help in six games for Ottawa this season.