Hermann scored two goals in two matches for the second season running in 2009, when he netted with headers against both Liverpool and Manchester City. In December 2009, he scored the first goal in a 2–0 victory against Burnley. On 27 March 2010, Hermann snapped his achilles tendon in an away match against Tottenham Hotspur and was ruled out for the rest of the season. After the match, Spurs and former Portsmouth manager Harry Redknapp commented, "The game was soured by Hermann's injury. The lads said they heard it pop." Due to this injury, Hermann was unable to play in the 2010 FA Cup Final.