Also thanks to outstanding players such as Antonio Langella, Gianfranco Zola, Mauro Esposito and David Suazo, Arrigoni went on leading his team to a very good season that ended in 12th place.

However, after the players called for his return, with captain Cristiano Lucarelli declaring "The team is united against the club", Arrigoni was reinstated two days later.

Despite an impressive win at San Siro against AC Milan in the first league week, Arrigoni made a disappointing start in his season back in the top flight, and was ultimately sacked on 3 November 2008 following a crush 5–1 loss against relegation-battling rivals Cagliari.

[2] Under his tenure, Triestina did not improve its results and were ultimately relegated to Lega Pro Prima Divisione after losing a two-legged playoff to Padova.

On 26 June 2010, Arrigoni was named as the new coach of Sassuolo, replacing outgoing manager Stefano Pioli who was appointed at Serie A club Chievo.