Milan - Radja Nainggolan grabbed the equaliser in a 1-1 draw for Cagliari to dent the title ambitions of his parent club Inter Milan, who struggled to a third consecutive stalemate on Sunday.
They can also be caught by Lazio, in third, who are three points behind before their derby clash against fourth-placed Roma.
But the hosts failed to build on the momentum and the Sardinians stayed in the match until Nainggolan's deflected long-range equaliser on 78 minutes.
"I have a lot of respect for Inter, the fans and for my teammates, but on the other no, I'm happy. They treated me a little badly, as if I was a mediocre player."
Inter are the ex-Roma player's favourite victim having scored six career goals against the northern club, four at the San Siro.
The game ended in chaos with Conte arguing with match officials, before storming off.
"The annoyance always arises when you don't win, we always want to win.
Martinez, who has scored 11 league goal this season, now risks missing the Milan derby on February 9.