The Morwell teen was last seen on January 9, 2019, at his home in Elgin Street.
Police and family are concerned for Nikolas due to the length of time that he has been missing.
He has spoken to family members by text but no one has seen him.
Nikolas walks with a limp and police believe that he may be in Shepparton or Melbourne.
Anyone who sees Nikolas or who has information on his whereabouts is urged to contact Morwell Police Station on (03) 5131 5000.