The wrestling legend - known as 'The King' - collapsed from a heart attack while commentating on WWE Monday Night Raw yesterday and had to be rushed from ringside for medical attention.
It was later reported that Lawler would undergo surgery, although he was revealed to be breathing on his own.
Lawler's ex-wife Stacy Carter revealed on Twitter that the 62-year-old underwent the procedure earlier today, but did not have open heart surgery.
"He had a stint & a balloon put in. Right now he is still heavily sedated," she posted.
WWE has now said in a statement: "As of this morning, Jerry 'The King' Lawler is in a cardiac care unit and all his vital signs are stable.
"WWE will provide additional information as it becomes available. We continue to wish Jerry all the best for a full recovery."