Ulster are searching for a replacement for Christian Lealiifano and are exploring the chances of taking either Joey Carbery or JJ Hanrahan to Ravenhill on a short-term basis.
The Australian's contract runs out after round six of the Champions Cup when we will return to the Brumbies and Les Kiss is searching for a replacement.
With Paddy Jackson unavailable for personal reasons, the northern province are struggling for depth in the number 10 position.
Ulster coach Les Kiss is not ruling out a move for Carbery or Hanrahan who find themselves behind others in the pecking orders at their clubs at the moment.
"That's a possibility," he said.
"If you're going to ask for someone, it's hard for another province to release a guy because you can be down a player like that, it's such a challenge.
"Remember too we are looking for a player who will not be involved in Six Nations or provincial rugby during February, March or April.
"We are looking worldwide at the options and hopefully it can get sorted keeping in mind we need an experienced outhalf who has leadership experience."
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