Mexican club America, who spent around $20 million on reinforcements in the mid-season break, fired coach Ramon Diaz on Tuesday after a poor start to the Clausura championship.
The Argentine was dismissed after his side won only one of their first four games in the tournament, which is played in the second half of the Mexican season.
"Unfortunately, the results have not been forthcoming and the decision has been made to change the technical staff," said the club in a statement.
Club president Michael Bauer told reporters: "The important thing for America is the results."
America dominated Mexican football during the 1980s when only one championship was played per season but, despite considerable financial backing, have lost their grip in the last few years, winning only two titles since 1990.
America's signings for the Clausura included Chile striker Jean Beausejour, Colombian Andres Chitiva, defender Juan Carlos Valenzuela and midfielder Pavel Pardo, Mexico's most capped international.
Diaz, 49, a former Argentina international, took over last June.
He has won six Argentine titles, five with River Plate and one with San Lorenzo, as well as the South American Libertadores Cup with River.
Two separate championships per season are played in both Argentina and Mexico.