Adams is expected to be sidelined for six to eight weeks.
"We are aware of the situation regarding Mike Adams being stabbed earlier this morning," Steelers general manager Kevin Colbert said. "We are in direct communication with both Mike and his family. Mike is expected to make a full recovery."
Adams' agent Eric Metz told NFL.com that Adams was stabbed after confronting three assailants who allegedly tried to steal his truck. Adams then gave chase after being stabbed.
According to the Pittsburgh Post Gazette, the 6-foot-7, 323-pounder had surgery at UPMC Mercy. The report says that the knife wound involved no vital organs.
A 2012 second-round pick, Adams started six of the 10 games he played last season.