Deac started his career in 2004 in the 2nd team of Gloria Bistrita and moved in January 2005 to Unirea Dej. After a year he moved again to the club and came to CFR Cluj. In January 2008 he was awarded for six months at Oţelul Galaţi and played since 1 July 2008, again at CFR Cluj. His transfer to FC Schalke 04 was announced on August 27, 2010. He signed a predating to 30 June 2013 contract. On 25 May 2011 it was announced that Deac will be awarded in the 2011/12 season to Rapid Bucharest. After the end of the loan, he joined the Romanian champions CFR Cluj, for which he already played from 2006 to 2010.
Deac was in the extended squad of the Romanian national team for the 2008 European Championship in Austria and Switzerland, but managed not to jump into the final 23 -man squad. Since 2010 it belongs to the team of coach Razvan Lucescu firmly and came on March 3 friendly against Israel for his first deployment.
Achievements / Title
- Romanian Master (2): 2007/ 08, 2009/10
- Romanian Cup Winners (3): 2007/ 08, 2008/ 09, 2009/10
- Romanian Super Cup Winners (2): 2009, 2010
- DFB Cup winner: 2011