Career
Standing at 6 ft 7 in (201 m), he plays the small forward and shooting guard positions. During the 2012-2013 season with Neptūnas Klaipėda, Gailius averaged a career high of 17.0 points, 5.6 rebounds and 2.1 assists per game in the Lithuanian League. Foreign the 2013-2014 season he played with the Slovenian team Union Olimpija.
In August 2014, he returned to Neptūnas signing a one-year deal.
In June 2015, he signed a two-year deal with Lietuvos rytas. Gailius played for Lithuania national team at the 2007 International Basketball Federation U-19 World Championship, finishing in 9th place.
In 2014 coach Jonas Kazlauskas included Gailius into preliminary 24 players list for main Lithuania national basketball team Though, he did not make into the final roster.
In 2015 he was included into the extended candidates list once again.