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Antonio Calanni, Associated Press
AC Milan forward Zlatan Ibrahimovic, of Sweden, walks off the field after receiving a red card during the Serie A soccer match between AC Milan and Napoli at the San Siro stadium in Milan, Italy, Sunday, Feb. 5, 2012.

ROME — Juventus and AC Milan each played to scoreless draws Sunday as the top of Serie A remained unchanged, but Milan standout Zlatan Ibrahimovic was sent off for punching an opponent and could face a multi-game ban.

In the 64th minute of Milan's match with Napoli, Ibrahimovic landed a right hook into defender Salvatore Aronica's head.

Ibrahimovic will miss a difficult game at Udinese next weekend and, if he is suspended for up to three matches, will also miss a match with Juventus on Feb. 25.

Juventus, which was held 0-0 at home by Siena, leads Milan by one point and has a game in hand.

Also Sunday, Roma routed Inter Milan 4-0 in a match postponed by 24 hours due to a rare snowstorm in the capital.