Background
Katnić, who grew up with Play-Office from Užice and Atlas, made his professional debut with Mega Ishrana in the 2005-2006 season.
Katnić, who grew up with Play-Office from Užice and Atlas, made his professional debut with Mega Ishrana in the 2005-2006 season.
In March 2010, he left Mega and signed with Crvena zvezda, playing there for a couple of months. In December 2010, he signed a deal with Oostende. In July 2013, he signed with Anwil Włocławek.
He left them in February 2014, and signed with Radnički Kragujevac for the rest of the season.
On December 10, 2014 he signed with KK Igokea. On July 8, 2015, Katnić signed with the Slovenian club KK Krka.
On December 9, 2015, he left Krka and returned to Igokea for the rest of the season.