A thumb injury is expected to keep Indiana quarterback Kurtis Rourke on the sidelines next weekend when the Hooisers host Washington in a Big Ten game, multiple outlets reported Sunday.Rourke suffered the injury on his right (throwing) hand in the second quarter of Saturday’s 56-7 thrashing of Nebraska. The injury apparently occurred when his hand hit the helmet of a Nebraska player.It was not clear Sunday how much time Rourke is expected to miss.With the Hoosiers up 28-7 at the half, Rourke did not return to Saturday’s game after halftime and backup Tayven Jackson took over.