"As of this morning, Jerry 'The King' Lawler is in a cardiac care unit and all his vital signs are stable," the WWE said in a statement. "WWE will provide additional information as it becomes available. We continue to wish Jerry all the best for a full recovery."
The wrestler collapsed during a broadcast of "Monday Night Raw" at the Bell Center in Montreal during a tag-team match featuring Kane and Daniel Bryan versus the Prime Time Players, The Los Angeles Times reported.
Emergency medical procedures were administered to Lawler, 62, who had wrestled in an match earlier in the evening.
He was carried out of the arena to a Montreal hospital as the match continued.
His ex-wife, Stacy Carter, said in a Twitter post the wrestler underwent an angioplasty procedure.
"He had a (stent) & a balloon put in," she wrote. "Right now he is still heavily sedated."