"One month and a half ago if you tell me you're going to have this trophy with you again, I will say, This year will probably be too difficult," said Nadal who arrived in Paris this year without any tuneup tournament win, the first time in his career.
"I don't like to individualize," the 67-year-old said. "Today that was the [strikeforce] we chose, tomorrow it may be another. They have to work for the team, just as they all worked for the team. I want the whole team to have that mentality because it's the only way to win."
"We've had a few difficult days and some players haven't been 100% but we're confident of a positive result," he said. "We have a clear way of playing and hopefully it will pay off."
The 28-year-old was earlier forced to leave a training session at Brazil's Granja Comary base in Teresopolis, near Rio de Janeiro, to undergo physiotherapy.
The Real Madrid player heaped praise on Peru, who he said would test the five-time world champions, despite the absence of their captain and all-time leading scorer Paolo Guerrero because of a knee injury.
"I don't have much to say but that I was completely overplayed by Rafa, by a better player on the court," said Djokovic in the post-match conference.
In Thursday's only other fixture, Athletico Paranaense were held to a goalless home draw by Ceara. Enditem
Honda, who joined the Rio de Janeiro club in February, capitalized on an errant clearance from goalkeeper Luan Polli to lash an unstoppable 20-yard shot into the top left corner.
The famous son is the 2020 Formula 2 racing series leader.
Argentina has been one of the worst-affected countries by the virus with more than 856,000 positive cases and over 22,700 fatalities.
"What my family wanted was to see me happy. There are things that are not known, but at Barcelona they send you away to train separately... My wife was the one who saw that I was down and let me take the opportunity. When Atletico came looking for me, I didn't hesitate for a moment."