Since 2003, Žalgiris Kaunas started to fade away from all the EuroLeague glory they had a few years ago. Žalgiris' EuroLeague results got worse every year. In the 2005–06 season Sireika was dealing with huge amount of criticism aimed at him, because of poor results in EuroLeague and Lietuvos rytas Vilnius was at the top of the Lithuanian league standings. On March 28, 2006 in a LKL regular season rivalry game, Sireika's coached Žalgiris played against Lietuvos rytas and lost the match by 30 points. After the game Sireika left the team.