Title-chasing AC Milan have been their own worst enemy in recent weeks, according to veteran midfielder Gennaro Gattuso.
The Rossoneri once held a seven-point lead over Napoli, while defending champions Inter Milan were 13 points behind.
Now with nine rounds remaining, Milan are just two points clear of Inter and three ahead of Napoli.
"We must give much more," Gattuso said. "What we are doing right now is not enough.
"It's partly our fault because we had a chance to extend our lead in recent weeks and instead, we have allowed Inter and Napoli to cut the gap.
"We must make sure we get back on track immediately."
Milan drew 1-1 against bottom-side Bari before losing 1-0 at Palermo on Saturday.
The Rossoneri host Inter on April 3, with momentum certainly with their city rivals.
"Victories are the ones that give you confidence," Gattuso said. "Inter have the edge right now having progressed to the Champions League quarter-finals and after recovering in the league."
To add spice to the upcoming derby, it will be the first time that Inter coach Leonardo will take on the team he played for from 1997 until 2001 and coached last season.
Leonardo joined Inter in January after leaving the Rossoneri last summer.
"It will be strange to see Leonardo on the other side," Gattuso admitted. "But he is getting good results.
"For me, he (Leonardo) will be just a rival."
