Gloucester's club doctor Rob Mackay was in positive mood on Wednesday after the management team had received feedback from the specialists.
Commenting on www.gloucesterrugbyclub.com Mackay said: "There is no problem involving the spinal cord or nerve structure, which is positive news."
McRae was back at home in a neck brace on Saturday evening after the game, and the Club's medical team will be keeping a close-eye on his progress.
"Duncan has soft tissue and ligament damage in his neck. He's got to follow a rehabilitation programme, but it is too early to say with certainty as to the length of time he'll be missing from the first team, but we are talking a matter of weeks rather than months," added Mackay.
McRae had been in superb form for the Kingsholm club in recent weeks, slotting four drop-goals in nine games before the Ulster clash, and adding pin-point accuracy with his boot in open play.
Director of rugby Nigel Melville said: "Duncan is a tough character, but it was a big shock to him. He's seeing the physio and on the path to recovery, but we won't be rushing him back."