The two South American nations go head to head in Belo Horizonte with a spot in the quarter-finals at stake.
Despite having to take on the hosts and one of the favourites to win the tournament, Pinilla has revealed that the Chile squad is feeling confident of making it through to the next round.
"It is going to be a difficult game," he told TuttoMondiali.it. "We are facing the team that everyone considers the favourites, but we won't make a drama out of it because, to be honest, we're not remotely afraid of Brazil."
Pinilla has scored six goals in 29 appearances for Chile.