Chiacig grew up in the youth ranks of
Benetton Treviso, making his debut for the side in a first division
Serie A game on 6 February 1994, playing 4 minutes. After a one-year loan to
Serie A2 side
Floor Padova, he broke into the first team. The Italian moved abroad in 1996, spending one year with
Greek Basket League side
AEK Athens. Returning to Italy in 1997, he signed with
Teamsystem Bologna. With the Bologna team, he would win the
Italian Cup and
Italian Supercup in 1998. He stayed there until early 1999, finishing the season with
Zucchetti Reggio Emilia. Chiacig then spent the 1999-2000 season with
Zucchetti Montecatini. Joining
Montepaschi Siena in 2000, he spent 6 seasons with the club, winning the
2001–02 FIBA Saporta Cup, the
2003–04 Lega Basket Serie A and another Italian Supercup in 2004. He then moved to the Spanish
Liga ACB in 2006, with
Pamesa Valencia. However, he only stayed until February 2007, finishing the season with
Pallacanestro Virtus Roma. In 2007, he joined
La Fortezza Bologna, rivals of former club Fortitudo. He stayed there for two years, winning the
2008–09 FIBA EuroChallenge. Chiacig then moved to
Scafati Basket in 2009, also staying there two years. After another season at Pallacanestro Reggiana, he joined
Angelico Biella in September 2012. He was released after around three months, joining amateur side Costone Siena in January 2013. Chiacig only stayed a month with Costone, signing with
Fortitudo Agrigento in February. The next year he had another stint with Scafati Basket. In 2014 Chiacig returned to the club where he had the most success, Mens Sana 1871 Siena (formerly Montepaschi), by now in the third division
Serie B Basket. ==International career==