Surgery is not required, the team added, but he will remain out for two to three months.
The 30-year-old, coming off a breakthrough season for Minnesota, suffered the injury with training camp scheduled to open on Friday and the start of the season set for October 8.
Harding was expected to be the backup in Minnesota after sitting out since December due to complications with medication he was taking to treat his multiple sclerosis.
The team also announced on Wednesday that free agent goalie Ilya Bryzgalov will join the team when training camp opens on Friday.
- Marc Weinreich