Julio Grondona, the President of the Argentina Football Association (AFA), has told Fox Sports that there would be no official announcement of Sabella's appointment since almost everyone have come to know of it.
He said, "The details are being finalised but Sabella has already been presented (in the media) and will be coach from here ... until the World Cup in Brazil, contingent on Argentina qualifying for the tournament."
Sabella, 56, was assistant to Daniel Passarella at the 1998 World Cup and is the fourth coach to take charge of Argentina in five years. He is expected to speak to the press at Argentina's Ezeiza training camp on the outskirts Buenos Aires.
In order to be free for the Argentina job, the 56-year old has reportedly withdrawn from a deal with UAE club Al Jazira.
Sabella, a former River Plate and Estudiantes playmaker, has a hard task at hand in trying to win a trophy with a traditionally talented side who have not won a major international title in 18 years.
Argentina's last international trophy was their Copa America title triumph in 1993.