Lealiifano joined from Brumbies on a short-term deal in August and is due to head back to the Super Rugby side in early 2018.
The fly-half, who was diagnosed with leukaemia last year but returned to the sport in July after revealing he was in remission, is yet to fully consider remaining at the Irish province longer than initially planned, but suggested he would be open to it.
"I can't look too far ahead. I'll go until the end of January and do the best I can," Lealiifano told BBC Sport.