The game at AJ Bell Stadium was help up for 18 minutes while 33-year-old Warwick received treatment for a neck injury before he was taken to hospital.
But the Australia-born player, who joined Worcester from French club Stade Francais last year, has given an encouraging update.
Warwick said on Twitter: "Really appreciate all the concern! Very much precaution I think, but as always thank you to all involved in taking care of me!"
Worcester lost the game 21-3 as Sale set up a probable Pool One decider against Biarritz in France next Saturday.