MILAN, Nov 13 (Reuters) - Serie A strugglers Cagliari have reappointed former coach Nedo Sonetti after sacking Marco Giampaolo, the club said on their website on Tuesday. The Sardinians are hovering above the relegation zone but are on the same points as bottom club Empoli after winning just two games this term. Sonetti previously coached the side in the 2001/2002 and 2005/2006 seasons. Cagliari's match at AS Roma on Sunday was postponed after a policeman shot dead a Lazio fan and riots followed. The game has been rearranged for Dec. 5. Siena parted company with coach Andrea Mandorlini on Monday and also brought back a former manager, Mario Beretta, while fellow relegation candidates Livorno and Reggina have already changed coaches this season.