Suisham will undergo surgery on his left knee this week and is likely to be placed on injured reserve, ending his season, according to the reports.
Suisham, the only kicker on the Steelers' 90-man roster, suffered the injury while attempting to make a tackle on the opening kickoff of the second half.
Suisham made 90.6 percent (29 of 32) of his field goal attempts last season, tied for fifth-best in the NFL. The 11-year veteran is an 84.1 percent kicker for his career.
ESPN.com's Jeremy Fowler contributed to this report.
Report: Suisham out for season
Dan Graziano, Jim Trotter and Louis Riddick react to the report that Steelers kicker Shaun Suisham is out for the season with a torn left ACL.