Leicester Tigers captain Toby Flood has been taken to hospital after he was injured in a collision with Ulster lock Dan Tuohy.
The pre-season match at Welford Road was stopped for 10 minutes, while Flood was stretchered off the pitch. Tuohy was shown a yellow card.
Coach Paul Burke says Flood is "conscious and going through standard medical checks". The fly-half, seeming in good spirits, tweeted a picture of him on a stretcher, asking "How's everyone else's day going?"
Well-wishers, including Ulster, took to the social networking site to wish Flood a speedy recovery.
Leicester Tigers scored two tries in each half, beating Ulster 30-10 at Welford Road. They face Ulster again in their Heineken Cup opener on October 11.
Tigers host Worcester Warriors next Sunday as the Aviva Premiership season gets underway.