The Ducks say Manson was hurt during Monday's 1-0 win over the Minnesota Wild. He went pointless with 6:14 in ice time during the contest.
Manson sat out the team's 3-2 loss to the Wild on Wednesday.
The 29-year-old has yet to record a point in three games this season. He had nine points across 50 games in 2019-20
His best season came in '17-18 when he put up 37 points in 80 games with the Ducks, with whom he's spent all seven of his NHL campaigns.