The Albiceleste went down to a Marcelo Moreno header midway through the first half, but a point was secured at the Hernando Siles - some 3,637 meters above sea level - thanks to Ever Banega on the cusp of halftime.
"It was a great game and our performance in the last 25 minutes alone deserved a win. The group of players who produced this good result will have become stronger," Sabella said after the match. "But we must go slowly and think about the difficult games that lie ahead, even if we have a big chance of qualifying [for the World Cup finals in Brazil]."
He added, "These matches have proved that I have a tightly-knitted bunch who are consolidating themselves, but the others are also working very hard to make my task of [choosing a 23-man squad] even more difficult."