RIO DE JANEIRO, Feb. 15 (Xinhua) -- Brazil's Gremio suffered a shock 2-1 loss to Chilean champions Huachipato in their opening Copa Libertadores group match in Porto Alegre on Thursday.
Federico Falcone and Braian Rodriguez struck either side of the break for the visitors before Argentine striker Hernan Barcos netted a second-half penalty in his first match for Gremio since his three million U.S. dollars move from Palmeiras.
Veteran Gremio midfielder Ze Roberto bemoaned his team's lack of coherency after a series of key arrivals and departures over summer.
"We knew that we had to be switched on going into the match and that they would be capable of causing an upset," the former Real Madrid and Bayern Munich midfielder said.
"We didn't lack commitment. What we need is more time playing together as a group. We have to keep our heads up because we have another important match coming up against Fluminense and we are going to rectify what went wrong here."
In other Copa Libertadores results on Thursday, Palmeiras overcame Sporting Cristal 2-1, The Strongest defeated Arsenal de Sarandi 2-1, Deportes Tolima edged out Cerro Porteno 2-1 and Newell's Old Boys beat Olimpia 3-1.