Ulster's medical team are assessing the extent of a neck injury to scrum half Connor Young who had to be taken to hospital in Rotherham after he was injured as early as the sixth minute.
Play was held up for seven minutes while Young received attention. Later he was taken off by stretcher and driven by ambulance to hospital as a precaution.
The Ravens' miserable run in the British and Irish Cup continued at Clifton Lane in South Yorkshire where they lost their fourth consecutive game in Pool 2.
The Championship side, who included former Ulster flanker Ali Birch, were far too strong in both attack and defence as the Ravens were beaten convincingly by seven tries to two.
A young Ulster side, containing several teenagers from the province's academy, nevertheless competed wholeheartedly and while they were outclassed at times, they scored two tries late in the second half to gain some respectability.
Scores on 74 and 80 minutes by forwards Charles Butterworth and replacement hooker Paul Jackson, both of which followed sustained periods of pressure close to the Rotherham line, were fully deserved.
The Ravens return to Yorkshire this weekend to face Yorkshire Carnegie at Huddersfield and coach Kieran Campbell said: "We are most disappointed that we have not given better performances in the competition. We showed tremendous spirit against Rotherham to stay in the game.
"There were some good individual performances. Some of young players stood up and we have a lot of talent with promise. For example, Sam Arnold did well in the centre and full back Ricky Andrew also looked good."