|Date of birth||4 April 1992|
|Place of birth||Zagreb, Croatia|
|Height||1.73 m (5 ft 8 in)|
|GNK Dinamo Zagreb|
|2012–2014||→ Lokomotiva (loan)||72||(8)|
|2014–2016||→ Spezia (loan)||65||(8)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 1 June 2016.
‡ National team caps and goals correct as of 8 March 2017
Šitum's senior career began when he was promoted from the Dinamo Academy to the first team in 2011, making his first-team debut in the same year in a 3-0 win over Czech side Sigma Olomouc. On the 19 February 2011 he started and played 75 minutes in a friendly against NK Istra 1961, which Dinamo won 4-3 at the newly renovated Stadion Aldo Drosina in Pula. His first league appearance came on the 26 February 2011 in Dinamo's game against Karlovac. Šitum started the match and scored in the 12th minute, a goal which turned out to be the game winner. Šitum started on a high note in the 2011-12 season, scoring the fourth goal in a 5-0 win against NK Karlovac, and then scoring twice in a 4-0 win against NK Osijek. He scored again in the next round, netting the only goal in a win against NK Lučko.
Internationally, Šitum scored his first goals for the Croatia under 21 side, during qualification for the 2015 UEFA European Under-21 Football Championship in the match against Liechtenstein where Šitum scored the first two goals in a 4-0 win.
- "Chelsea midfielder named to Croatia squad to face Italy, Gibraltar". weaintgotnohistory.sbnation.com. 26 May 2015. Retrieved 17 November 2015.