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"He would be very underprepared…in a perfect world Packer would be ideal but we'll look to the Tigers to get him ready, and if he's still available in three or four weeks we'll look at it then," O'Sullivan told Newstalk ZB's Martin Devlin.
Ben Murdoch-Masila is only a remote late season prospect, even though the player himself would like to head back to his home town.
The 29-year-old Warrington and Tongan forward has a three-year deal with the Warriors from next year. The European Super League is on hold because of COVID-19 but it appears Warrington will not allow an early release.
"It doesn't look like they will get back on the field until August," O'Sullivan said.
"It is a bit of wait and see. Each week that goes by makes it less and less attractive for us.
"He will have to come home, isolate, get enough time in the legs to prepare for an NRL game. Even if he got on the plane tomorrow, it would be the best part of six weeks before he could play."
And the Paul Gallen story had more legs in it than Gallen may as a first grader.
O'Sullivan said the Warriors were very appreciative of the offer from the great Sharks forward to come out of retirement.
"He's 39, and we've got young players who back themselves," said O'Sullivan.
"It was a good story and created a bit of a distraction as well."
So the one newcomer for now is Murchie, who could play in the middle at a pinch.
O'Sullivan said that while loan players were a part of the European competition, NRL clubs at this stage were not putting their hand up.
There were no downsides for the parent club, who could recall the loan player at any stage. And with competitions below the NRL cancelled, the player would be getting valuable game time.
"It's a no brainer, to get their number five or six prop a bit of game time," he said.
"I've got no doubt (we will get a player) in a matter of days rather than weeks. We've got some irons in the fire."
O'Sullivan said he could not be prouder of the squad's attitude, and they weren't in Australia "to be the good guys".
But the proof of the pudding would come on match days, starting this Saturday.