In 2004, Grizelj signed for German side
KSC. In 2005, he signed for Croatian side
Istra. In 2006, he signed for Croatian side
Šibenik. In 2008, he signed for Croatian side
Trogir. In 2009, he signed for Croatian side
Mosor. After that, he signed for Croatian side
RNK Split. He helped the club achieve promotion. In 2011, he signed for Croatian side
Solin. In 2012, he signed for Croatian side
Mosor. In 2013, he signed for Icelandic side
Grindavík. He was regarded as one of the club's most important players. In 2015, he signed for Icelandic side
KA. In 2017, he signed for Croatian side
Keflavík. ==Post-playing career==