Les Parisiens have fallen to second in Ligue 1 and have failed to win any of their previous four games in all competitions, including last weekend's surprise 2-1 defeat to Nancy.
The big-spending outfit face rivals Olympique de Marseille on Sunday, who themselves are also going through difficulties on the pitch.
Despite their recent struggles, Hoarau admits PSG have no one else to blame but themselves.
"I would not say there are doubts. We were asked questions; how do we relaunch our challenge? We've worked all week, the coach was happy. We've been criticised recently, and we deserve it. Teams say they can hit PSG, and we must stop it," the forward told AFP.
The France international then discussed the importance of the game against Marseille and stated that only a win would be good enough for their championship hopes.
"This is a game that can be worth six points," he said. "We need the three points, that's for sure, but psychologically, we need to get back to winning ways. There are Clasicos more important than others and this one is very, very important," he added.
However, when asked if there was a crisis at PSG, Hoarau strongly refuted such claims.
"We are co-leaders of the championship. We refuse to use that word. The crisis is when nothing goes right; this is not the case. We just need to find the defensive rigour and effectiveness as before. We know what to do to make the game easier," he concluded.
Hoarau has made 15 Ligue 1 appearances this term, scoring five times.