Ticket sales have also been disappointing for the games - against Paraguay in Yokohama on September 4 and particularly for the September 7 in Osaka for which only 15,000 have been sold.
Hara has been criticised in his role as technical director for the Japan Football Association (JFA) for failing to tie up a contract with a high-profile successor to Takeshi Okada.
However, the 51-year-old picked a strong squad underpinned with eight European-based players, including midfielders Keisuke Honda and Makoto Hasebe, who were instrumental in Japan's run to the last 16 of this year's World Cup in South Africa.
"We have been informed at least half of the Paraguay team will come, including (Borussia Dortmund's Lucas) Barrios and (Manchester City's Roque) Santa Cruz," Hara told reporters.
"It would have been good to have the new coach in place but unfortunately it hasn't worked out like that."
