Greg Savage of is reporting that sources have informed the website that a much anticipated match between Gesias “JZ Calvan” Calvancante and Shinya Aoki scheduled for Dec. 31 in Japan on the Yarennoka! card appears to be in jeopardy.

Despite Calvancante making no mention of the match possibly being off during recent interviews and M-1 Global CEO Monte Cox being quoted as saying that he’s heard nothing about the match being canceled, sources insist that an announcement will likely be made this week that the bout is off.

According to Savage, it is believed that Calvancate recently underwent surgeries on his nose and his knee and has been unable to train for the scheduled bout.