Juventus goalkeeper Gigi Buffon believes they're still suffering bias from referees after Sunday's 2-2 draw at Parma.

Buffon is angry over the penalty handed to Parma striker Reginaldo early in the first-half and rapped: "Yet another penalty was given against us and it will be difficult to stay in the title race at this rate.

"This keeps happening despite the two revoked Scudetti.

"A referee has to be sure when he gives a penalty otherwise he shouldn't give it. I only talk when I'm certain of the facts like I did at Napoli."