The 19-year-old winger has been released by the Premier League outfit, he himself announced on Saturday.
I'm sad to say i will be leaving West Ham United at the end of the season, it's been a pleasure to play for the hammers, can't thank everyone at the club enough for giving me the chance to play at such a great club and can't thank the staff and the fans enough for the support you have given me and my family while going through the loss of my brother, it's been a great pleasure to play for the claret and blues #whufc #hammers #dt38
The writing was on the wall for Tombides for some time, as he has been playing for the Hull City Academy in recent weeks.
The Australian youngster will now be hoping to progress at the Tigers and break into the first team of the Yorkshire outfit.
Tombides is the younger brother of Dylan, who passed away in April of last year at the age of 20 following a three-year battle with testicular cancer.
West Ham are currently 11th in the Premier League table with 47 points from 37 matches and could still finish in the top 10.
Meanwhile, Hull find themselves third from bottom in the standings at the moment with 34 points from 37 games, two points behind 17th-placed Newcastle United.