Dr Singh, who is now on a visit to Brazil [ Images ] and Cuba, did not specify when he would appoint the new minister.
He leaves for South Africa [ Images ] by the end of September for a bilateral meet.
He, however, refused to give any hint on who would be India's [ Images ] next foreign minister.
Asked whether a cabinet reshuffle was also on the cards, Dr Singh said, "As of now I am thinking of only have a foreign minister."
The foreign minister's position is lying vacant ever since Natwar Singh resigned from his post in December 2005 over the United Nations oil-for-food scam.