Leicester fly-half Toby Flood was taken to hospital after a collision during a pre-season friendly clash with Ulster at Welford Road.
The 28-year-old England star sustained the injury under a challenge from Dan Tuohy, who was shown the yellow card by referee Tim Wigglesworth.
The Tigers announced via Twitter: "On Toby Flood, Paul Burke says he was taken to hospital where he is conscious and going through standard medical checks."
Flood himself Tweeted a picture of himself in a neck brace, adding the caption: "How's everyone else's day going?"
The picture posted by Flood shows him with what appears to be a small amount of blood below an eyebrow, and with a thumbs-up at the side of the shot, although it is not clear whether the thumb is Flood's.
Leicester won the match 30-10, with play resuming after a 10-minute break once Flood was carried off on a stretcher.
The fixture was arranged to help Leicester with their preparation for the new Aviva Premiership campaign, which for the Tigers begins next Sunday, September 8, with a home game against Worcester.
Ulster stated on their Twitter wall: "Best wishes to Leicester's Toby Flood who was injured in today's game. Hoping he makes a speedy recovery."