The centre-half, who arrived at the French club in the summer from AC Milan together with Zlatan Ibrahimovic, stated that the support of the home fans could give Vitor Pereira's team the upper hand.
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"I think it will be a very important game. We are in good shape. Porto attack a lot, but we're not going there to defend."
"I am almost at 100 per cent. I had a hard time with my injury after the Olympics, but gradually I have come back and I'm almost at my maximum level now."
The 28-year-old also spoke about his relationship with Alex and Mamadou Sakho, and was quick to dispel reports he preferred playing with his fellow Brazilian in defence.
"I did not say I liked playing with Alex more, I just said that Alex has more experience. I want to apologize to Sakho because i didn't say that.
"I am very happy to play with Zlatan. He is a player who always wants to win, so I hope to play well tomorrow and win the game."
The Champions League Group A match between Porto and Paris Saint-Germain kicks off at 20:45CET on Wednesday.