On 2 September 2012, Klose scored his first Serie A goal of the season, scoring a brace in Lazio's 3–0 home win against Palermo. On 26 September, Klose accidentally scored a goal with his hand against Napoli for Lazio, unseen by the referee. However, Klose showed great sportsmanship by informing the referee and asking to discount the goal. The referee then reversed the decision and the goal was discounted.