Rome, June 16 - Mario Balotelli has pledged to keep his shirt on after he was booked for displaying his bare chest in celebration after scoring the winning goal in Italy's 2-1 over Mexico in their Confederations Cup opener in Brazil. The 22-year-old forward is now in danger of getting a one-match suspension if he gets another yellow card in Wednesday's second Group A match against Japan. "I didn't know about this rule about two yellow cards (incurring a suspension)," the AC Milan striker told state broadcaster Rai. "I won't do it next time". Italy coach Cesare Prandelli praised Balotelli for a fine performance in which he looked dangerous every time he received the ball. But he also called on him to stop taking off his shirt after he did the same thing at Euro 2012 after completing a double to help Italy beat Germany 2-1 in the semi-finals. "Mario must stop showing his muscles. Yellow cards count," Prandelli said. "Apart from that, bravo". The coach also praised playmaker Andrea Pirlo, who celebrated his 100th international appearance by pulling the strings in a deserved victory and scoring Italy's opener by whipping in a super free kick from outside the box. "You don't need words with Andrea, just applause," said Prandelli. "He's an example for everyone. We thanked him before the match".