Casting Raiders of the Lost Ark’s hero was the next step, and Steven Spielberg, after seeing The Empire Strikes Back, suggested Harrison Ford to play Indiana Jones, which George Lucas initially refused, not wanting the Han Solo actor in every movie he made. According to the Blu-ray featurette, Blue Bloods cast lead Tom Selleck won them over in a screen test with Ford’s future Blade Runner co-star Sean Young, ironically, as Marion Ravenwood. However, due to Selleck’s commitment to the original Magnum P.I. TV show, he had to drop out, giving Ford the chance to step in.
Article source: https://www.cinemablend.com/news/2566266/raiders-of-the-lost-ark-behind-the-scenes-facts-about-the-indiana-jones-movie