Bob Stoops, one of the three coaching giants of Oklahoma’s century-long football excellence, plans to tell his team Wednesday that he will retire after 18 seasons as the Sooner head coach. An OU source said offensive coordinator Lincoln Riley will take over as head coach. It is expected that Stoops will remain with the university in some capacity. Riley, 33, a native of Muleshoe, Texas, has been at OU for two seasons. “Great young coach, the program’s in great shape,” the source said. “Good recruiting class. Got a great young coach that anybody would want to have, ready to go. He’s as good a coach as there in America, at this stage in his career. “And Bob got to do it in his way. Doesn’t get any better than that.” This story will be updated.