Silla Koteswar, the Indian diplomat who was wounded in an Embassy Row stabbing Monday night, remained in serious condition last night following surgery at George Washington University Hospital.

Koteswar, 35, was operated on to repair injuries to his neck and side and was placed in the intensive care unit according to a hospital spokesman.

Koteswar was stabbed by an assailant armed with two hunting knives, one with an eight-inch blade, the other with a four-inch blade, according to police. The attack occurred as he was walking to his car in the back of the Indian Supply Mission at 2535 Massachusetts Ave. NW., where he works as an assistant director for purchasing.

Police and the FBI are investigating the possibility that Koteswar was the victim of a terrorist attack. But police said yesterday that they had not determined a motive.

O. N. Sheopuri, the Indian Emsy's press counselor, said Monday that embassy officials suspected that the incident involved the Universal proutist Revolutionary Movement, which he said was a front movement for the Anada Marga, described as a Hindu revisionist sect. Ananda Marga officials The Indian Embassy meanwhile, has requested additional protection from the uniformed division of the Secret Service on grounds that "we are on the market list," as one Indian official put it yesterday.

The embassies of Israel, Egypt, the Soviet Union and Iran have armed guards provided by their respective governments. But the Indians say they do not have the service because the cost would be prohibitive.