Lionel Richie remains hospitalized in the intensive care unit, and doctors are reportedly now looking into him potentially suffering from heart problems.

The singer, 77, is undergoing testing for cardiac-related issues, TMZ reported Tuesday.

He’s expected to be released from the hospital Wednesday, according to the outlet.

Page Six has reached out to Richie’s rep for comment.

The “American Idol” judge checked himself into a local hospital in St. Louis, Missouri, over the weekend after he struggled to finish his concert at the Muny Amphitheater Saturday.

Doctors were reportedly looking into “slight dehydration” as the cause.

During the concert, the Grammy-winning musician had to ask for a chair while performing his final song, “All Night Long,” so that he could sit down.

Richie addressed his dehydration issues and June hospitalization during the concert, according to the St. Louis American.

“Some things have been happening on this tour that kind of shook me up a little bit, because I couldn’t figure out what the hell was going on,” he told the audience, adding, “I went back to the doctor, and he said, ‘You are suffering from dehydration.’”

He was previously hospitalized in June after he fell ill onstage and abruptly ended his concert early at the Grand Casino Arena in St. Paul, Minnesota.

Videos shared online at the time showed Richie — who is co-headlining his 26-city North American tour with Earth, Wind & Fire — being forced to sit down several times while singing “Dancing on the Ceiling.”

“When you’re feeling dizzy, sit your ass down,” he told the crowd, before he left the concert altogether.

Richie then canceled two concert shows in Chicago and Columbus, Ohio.

However, Richie assured fans he was fine in a July 4 Instagram post.

“Thank you for every message, every kind word, and for all your love. ❤️,” he wrote. “I’m doing well, and I’m grateful for all of you.”

The father of three has yet to comment on his latest hospitalization.