MOSCOW, Oct 28 Italian Monza defender Pablo Mari, who was stabbed in a shopping center in Milan, underwent surgery to repair two damaged back muscles, according to the official website of the football club. The attack occurred on Thursday. In addition to 29-year-old Marie, four other people were injured. It was noted that the attacker allegedly has mental problems, he was detained. The operation took place on Friday morning. It is expected that the player will stay in the hospital for two to three days, after which he will begin recovery. It is emphasized that with such injuries, two months of rest is usually required before resuming physical activity. Marie is on loan at Monza, the rights to him belong to the English Arsenal. This season, the defender has played eight matches in the Italian championship and scored one goal.