Eller is practicing with the Capitals on Thursday and is expected to play Friday in Colorado, as reports.
Eller won't be an option against the Maple Leafs on Wednesday, Sammi Silber of The Hockey News reports.
Eller was traded from the Penguins to the Capitals on Tuesday in exchange for 2027 third-round pick and a 2025 fifth-round pick.
Eller contributed an assist, one shot, one block and three hits in Saturday's 3-1 win over Montreal.
Eller notched an assist and two hits in Friday's 4-1 loss to the Hurricanes.
Eller recorded two goals (on three shots) and added two assists in Friday's 7-3 preseason win over the Blue Jackets.
Eller was one of six Penguins to play in all 82 games this season, registering 15 goals and 16 helpers.
Eller (illness) will be an option to face Detroit on Thursday, Wes Crosby of NHL.com reports.
Eller missed Wednesday's morning skate due to an illness and is consequently questionable for Thursday's contest versus Detroit, Wes Crosby of NHL.com reports.
Eller scored a goal on three shots and earned an assist versus the Capitals on Thursday.