The MACC is attempting to track down a "Tan Kim Loong" in relation to the 1MDB matter, and has released a photograph of him.
Tan's name has repeatedly appeared in several bank documents in relation to the alleged laundering of 1MDB funds.
In court proceedings against bankers in Singapore accused of being complicit in the 1MDB matter, witnesses had suggested that Tan's identity was used as an alias for businessperson Low Taek Jho.
Low, better known as Jho Low, was believed to be a central figure in the 1MDB scandal.
It is unclear if Tan was directly involved or had his identity misused.
The MACC said Tan is 40 years old, and that his last known address was in Kepong, Kuala Lumpur.
Tan was one of four people wanted by the MACC in a list released by the graft-buster today.
Three others are former 1MDB officers, namely Tang Keng Chee, 53, Geh Choh Heng, 47 and Loo Ai Swan 45.
The MACC said the four are wanted to facilitate in the 1MDB investigation.
"The individuals involved are asked to come forward or contact MACC immediately to assist in the investigation," it said in a statement today.
The MACC also asked the public who have any information about the four individuals to contact the commission at 03-88700000 (Extension 0323 or 0388).
Last Thursday, the MACC sought Low and SRC International director Nik Faisal Ariff Kamil to come forward.
SRC International was a former subsidiary of 1MDB. Like 1MDB, tens of millions of ringgit from SRC allegedly flowed into former prime minister Najib Abdul Razak's bank accounts. Najib had denied wrongdoing.
Another key witness, Suboh Mohd Yasin, who was also an SRC International director, is reportedly cooperating with the MACC following a change in government. He was offered full witness protection.