Despite Celtic coach Neil Lennon reaching an accord with new Vegalta boss Graham Arnold for the 21-year-old midfielder to reunite with his former Central Coast Mariners mentor, the club has shown little inclination to produce the necessary paper work to activate the loan.
And with no firm pledge emanating from Japan - despite Arnold's desire to secure one of Australian football's most prodigious talents - Rogic's handlers are now looking elsewhere to land the 21-year-old the game time which will secure his place in Australia coach Ange Postecoglou's squad for the FIFA World Cup.
Rogic's London-based lawyer-agent Daniel Berman was reluctant to reveal his hand when contacted by The World Game on Tuesday morning, saying only: "We have contingency plans in place."
It's believed the other options on the table include a possible stint in the English Championship or continental Europe, with a resolution possible by the end of the week.
Rogic has made just made just 14 appearances for Celtic - and only five starts - since heading to Parkhead from the Mariners a year ago.
The sticking point in Japan is that with the J.League season kicking off in the first week of March, Vegalta would only have Rogic available until 15 May - or nine games - before he heads into camp for his country to prepare for Brazil.
It's unclear whether Celtic would sanction a loan beyond that or demand Rogic returns for pre-season training directly after the FIFA World Cup.
Lennon, though, is happy to see Rogic leave the fold to garner game time - and enhance his FIFA World Cup prospects.
"I can't guarantee Tom game in, game out. And I think that's what he needs at the minute," Lennon said.
"He has only had 31 professional games in his career so some people are expecting him to run before he can walk. It will be good for Tom to go and get some football."
Capped eight times, Rogic is a key cog in Postecoglou's reconstruction of the national team leading into Brazil and also the Asian Cup on home soil next January.
But his lack of action is a grave concern to the coach who will only select players for Brazil who are playing regular football for their clubs.
Rogic, who has overcome a series of niggling injuries which hindered his progress at Celtic, showed in a domineering 30-minute cameo off the bench against Costa Rica in November what he is capable of.