Phuketwan has learned that a security guard working for Kedar state's HRH Tunku Annuar Ibni Sultan Badlishah was beaten by the men - who possibly mistook him for the Sultan.
Malaysian authorities are trying to keep the early morning surprise attack at Patong's Millennium Resort secret.
A fullscale alert has been launched across Phuket for the four attackers, who were filmed by security cameras as they fled.
Investigating police in Patong, on Phuket's west coast, are puzzled as to how the men obtained a key card to enter one of several rooms booked for the Sultan and his entourage.
The sultan is the alternative King of Malaysia if something untoward was to happen to the present ruler, Sultan Abdul Halim Muadzam Shah. Malaysia's state Sultans share the role of Malaysia's monarch in rotation.
The Sultan has been on Phuket since May 27 and was photographed the previous night being presented with a memorial plaque at a performance at the well known Phuket show, FantaSea.
He had booked about 10 rooms at the Millennium, attached to Patong's popular Jungceylon shopping centre.
Phuketwan has learned that police were called to the Millennium Resort after one of the sultan's personal guards, Mond Sobri Said, was beaten by the four men soon after midnight.
It;'s understood he raised the prospect with the Sultan that something might be wrong, and suggested a change of rooms.
When the personal guard walked into the alternative room, he was attacked, bound and beaten by four men, according to police sources.
The victims said he beleived one man was a Thai and three were Malaysians. Police are puzzled how they managed to use a keycard to access the room. The men went to the resort about 10.30pm last night.
Special arrangements are believed to be in place to make sure that the sultan is safe. All of Phuket's police are now engaged in hunting the four men.