Santiago Phelan has quit as the coach of Argentina's national rugby team, which just completed its second winless season in the four-nation Rugby Championship.
The Argentina Rugby Union announced the resignation on Monday but gave no reasons for his departure.
Argentina joined the Rugby Championship in 2012 and managed only a draw in six home-and-away matches against New Zealand, Australia and South Africa. This season the team lost all six matches, but went close to scoring upsets at home against No. 2-ranked South Africa and in Perth against Australia.
Argentina — known as the Pumas — is trying to upgrade its rugby profile but has struggled to compete consistently against three of the game's best national teams.
The Argentina Rugby Union was expected to name a replacement as soon as Tuesday.