Although he started the game at Ninian Park, he was replaced by Josh Lillis at the interval.
"The problem is quite low down the thigh and it wasn't from kicking the ball. It happened when I took off for a dive," explained Murphy to the Scunthorpe Telegraph.
"The physio was a little bit worried about it, but we will just have to wait and see. Hopefully just a week's rest and it will be all right again.