PSG have placed themselves in a commanding position ahead of the second leg at Camp Nou on March 8 after recording a 4-0 win in the first leg in Paris on Tuesday night.
Emery has hailed his team for their performance on the night, but has refused to admit that the French champions are already in the draw for the quarter-final stage of the competition.
"We used what we had worked on before the match. Barcelona is a great team with great players. We had to remain focused on the game for the full 90 minutes and we knew we would have to be efficient both individually and as a group to win the game," Emery told reporters.
"We played 90 minutes, but there are still 90 minutes to go in Barcelona. We'll continue to respect our opponent by working hard so that we have another good 90 minutes."
Angel di Maria scored twice for PSG on the night, while Julian Draxler and Edinson Cavani were also on the scoresheet as Emery's side shocked European football with a commanding win over the tournament favourites.