Adams' agent, Eric Metz, told NFL.com that the tackle underwent surgery after being stabbed in the stomach after three assailants allegedly tried to steal his truck on the South Side of Pittsburgh. Metz said no vital organs were hit, but the stomach injury did require surgery.
Adams is expected to be sidelined for six to eight weeks, but should return in time for training camp in late July.
"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."
There have been no arrests in the incident. Metz did tell the Pittsburgh Post-Gazette that one of the robbers dropped a cellphone, which police recovered.
Adams wrote on Twitter that he feels fortunate to have made it out of the incident alive.
"I had an angel looking out for me!" Adams wrote. "[I'll] be ok just gotta fight to get back harder then ever."
A 2012 second-round pick, Adams started six of the 10 games he played last season. He was the recipient of the Joe Greene Performance Award, given to the outstanding Steelers rookie.
Information from The Associated Press was used in this report.