PETALING JAYA - Malaysian opposition leader Lim Kit Siang will have to sit out several scheduled events over the weekend after sustaining a knock to his head, The Star reported.

The 77-year-old injured his forehead after slipping in the toilet at his Gelang Patah home in Johor Baru on Thursday night (March 1), according to a statement by his Democratic Action Party (DAP) issued on Friday.

"The injury was treated immediately at a nearby clinic. The doctor has advised that he rest well," the statement read.

Among the cancelled events were a coffee shop forum in Gelang Patah on Friday morning and another forum in Pekan Nanas, also in Johor, on Saturday morning.

"He will also miss an event commemorating the fourth anniversary of the MH370 tragedy on Saturday afternoon in Kuala Lumpur," it added.

The Gelang Patah Member of Parliament's planned visit to Sepang on Sunday will be rescheduled and he is also set to miss the Parti Keadilan Rakyat (PKR) fundraising dinner in Setia Alam in Selangor on Sunday (March 4) night.

The DAP, along with the PKR , are part of the four-party Pakatan Harapan opposition alliance which includes the Parti Pribumi Bersatu Malaysia and Parti Amanah Negara.

"He thanks all who have expressed concern and offered well wishes," the statement said.

Separately, the PKR's de facto leader Anwar Ibrahim, who is serving a five-year sentence for sodomy, on Thursday underwent an orthopedic minor procedure at the Hospital Kuala Lumpur, The Malay Mail Online news website reported.

In a statement after the procedure, the family said the procedure went well without any complications.

He was later allowed to return to the Cheras Rehabilitation Hospital to rest and receive follow-up treatment, the statement said.

He had previously received treatment at the hospital after undergoing a laparoscopic (keyhole) surgery to his right shoulder on Nov 12 last year, the website reported.