Buenos Aires: Argentina's new coach needs to resolve old problems ahead of World Cup qualifying matches against Bolivia at home on Friday and Colombia away four days later.
Blending a fearsome attack including Barcelona star Lionel Messi with a shaky defense proved beyond coach Alejandro Sabella's predecessors Sergio Batista and Diego Maradona.
Sabella must fix the inconsistencies quickly after his first two qualifiers in charge resulted in a promising 4-1 win against Chile, followed by a first ever loss at Venezuela.
Anything but victory against underdog Bolivia would put Argentina's campaign under mounting pressure.
Elsewhere in South America on Friday, early leader Uruguay hosts Chile, Venezuela travels to Colombia and Ecuador visits Paraguay.