season, Fiorentina started their domestic campaign strongly before steadily losing momentum and slipped to mid-table positions at the latter half of the season. In Europe, the team proved to be a surprise dark horse: after losing their first away fixture against Lyon, they staged a comeback with a five-match streak by winning all their remaining matches (including defeating Liverpool home and away). The Viola qualified as group champions, but eventually succumbed to Bayern Munich due to the away goals rule. This was controversial due to a mistaken refereeing decision by Tom Henning Øvrebø, who allowed a clearly offside goal for Bayern in the first leg. Bayern eventually finished the tournament as runners-up, making a deep run all the way to the final. The incident called into attention the possible implementation of video replays in football. Despite a good European run and reaching the semi-finals in the Coppa Italia, Fiorentina failed to qualify for Europe. During this period, on 24 September 2009, Andrea Della Valle resigned from his position as chairman of Fiorentina, and announced all duties would be temporarily transferred to Mario Cognini, Fiorentina's vice-president until a permanent position could be filled. In June 2010, the Viola bid farewell to long-time manager Cesare Prandelli, by then the longest-serving coach in the team's history, who was departing to coach the Italy national team. Catania manager Siniša Mihajlović was appointed to replace him. The club spent much of the early 2010–11 season in last place, but their form improved and Fiorentina ultimately finished ninth. Following a 1–0 defeat to Chievo in November 2011, Mihajlović was sacked and replaced by Delio Rossi. After a brief period of improvements, the Viola were again fighting relegation, prompting the sacking of Sporting Director Pantaleo Corvino in early 2012 following a 0–5 home defeat to Juventus. Their bid for survival was kept alive by a number of upset victories away from home, notably at Roma and Milan. During a home game against Novara, trailing 0–2 within half an hour, manager Rossi decided to substitute midfielder Adem Ljajić early. Ljajić sarcastically applauded him in frustration, whereupon Rossi retaliated by physical assaulting his player, an action that ultimately prompted his termination by the club. His replacement, caretaker manager Vincenzo Guerini, then guided the team away from the relegation zone to a 13th-place finish to end the turbulent year. To engineer a resurrection of the club after the disappointing season,