The Iranian team are due to come home with just one victory over the African Champions, Egypt, and three defeats against Brazil, Japan and Poland.
National teams from Brazil, Poland, Egypt, Cuba, Japan and Iran were present in the seven-day event.
The Iranian team, coached by Hossein Maddani, lost their fourth game of the event against Poland 1-3 on Sunday morning.
The World Grand Champions Cup is an international volleyball tournament which was created in 1993.
Men's teams from Iran have enjoyed recent success at the youth and junior levels, claiming the gold and silver medals in the last two Youth World Championships in Mexico (2007) and Italy (2009), along with a bronze in the FIVB Junior World Championship of 2007 in Morocco.