His first team in the LKL was Sakalai during the 2000 - 2001 season. In the fall of 2001 moved to BC Lietuvos Rytas, and played there until the year 2006. In his first season with the club he was averaging 8 points and 3.6 rebounds per game.
Jasaitis won the Lithuanion league championship in 2002 and 2006. He won the Baltic Basketball League Champion in 2006. He was the ULEB Cup winner in 2005. In the EuroBasket 2007, Jasaitis won the bronze medal. In 2008, he was the ACB champion.