The draw maintained the gap at the top to six points.
"The distance between us remains the same, but the end of the season is still a long way off," wrote the Slovak midfielder on his official website.
"We started the game well, then reacted to find the equaliser after their goal. We tried to double our tally, but were unable to do so. There is still a long way to go this term.
"The atmosphere at the San Paolo was wonderful thanks to our fantastic fans, such as that initial choreography."