Aho, who leads Carolina with 16 goals, missed four games with a concussion and lower-body injury.
The Hurricanes begin an eight-game homestand but have lost four straight on home ice.
Forward Magnus Paajarvi, claimed off waivers from the St. Louis Blues on Friday, will make his Senators debut playing on a line with Derick Brassard and Ryan Dzingel. Paajarvi, selected by the Edmonton Oilers with the No. 10 pick in the 2009 NHL Draft, has four points (two goals, two assists) in 44 games this season.
The Senators have scored seven goals during a five-game losing streak (0-5-0).