Marco Sau (born 3 November 1987) is an Italian professional footballer who plays as a striker for Serie A club Benevento.
Sau turned professional at Cagliari in 2007. On 25 June 2008 he was signed by AlbinoLeffe. On 15 July 2009, he was loaned to Lecco.
In August 2010 Sau was acquired by Foggia of Lega Pro Prima Divisione by head coach Zdenek Zeman in co-ownership deals, for a peppercorn of €500, scoring 20 league goals that season. In June 2011 Foggia acquired Sau and Salvatore Burrai outright for a total of €207,000 by a closed tender mediated by Lega Serie A. However they were returned to Cagliari on 31 August 2011 for the same total price (Burrai for free and Sau for €207,000). Foggia later brought the transfer to court to claim the transfer documents were falsified.
Return to Cagliari
Sau was re-acquired by Cagliari on 31 August 2011 on a two-year contract. He played at S.S. Juve Stabia in 2011–12 Serie B season, scoring 21 goals. This form allowed him into the Cagliari first team for 2012–13.
Sau scored both of Cagliari’s goals in a 2–2 draw against Inter on 18 November 2012.
On 29 August 2014, Sau renewed his contract with Cagliari until 2017.
On 31 January 2019, Sau signed with Sampdoria after seven years at Cagliari. After five goalless substitute appearances, he signed a two-year contract at Serie B’s Benevento on 22 July. He scored a hat-trick on 29 December in a 4–0 home win over Ascoli, and the following 29 June he came off the bench to score the only goal against his former club Juve Stabia to win promotion to Serie A as champions with seven games left.