Blatsis was born in
Melbourne. He started his career at his home club
South Melbourne making 104 league appearances before moving to
English Premier League side
Derby County in the summer of 2000. He subsequently joined First Division
Sheffield Wednesday on loan making six appearances. After making only two appearances for Derby he was released and in March 2002 joined Division Two side
Colchester United on a short-term deal. He made seven appearances for the club becoming a fan favorite in the process. However, he left the club at the end of the season. He then joined Turkish team
Kocaelispor, where he played until he left the club for financial reasons during his second season. A brief move to Irish club
St Patrick's Athletic followed, but after only two cup appearances he left in May 2004. After unsuccessful trials with
Coventry City and
FC Twente, he returned to his first club,
South Melbourne in early 2005. He stayed at the club until he retired in 2009 after a series of injuries. ==International career==