The U.S. national team pair's club will remain in Germany's top flight after fending off Kaiserslautern in the relegation playoff.
Despite a trying season in which the club was mired near the bottom of the Bundesliga standings throughout, Hoffenheim avoided relegation by topping Kaiserslautern 5-2 on aggregate after a 2-1 victory in the second leg of their relegation playoff on Monday.
Johnson started and played the distance, while Williams was not on the matchday roster. Both are slated to join the U.S. national team for the ongoing training camp.
Hoffenheim, which is also the parent club of U.S. winger Joe Gyau, finished the Bundesliga campaign in 16th place, only earning a place in the relegation playoff by defeating Champions League runner-up Borussia Dortmund on the road in the final game of the regular season.
Monday's result was not as encouraging for another young U.S.-eligible player, as Kaiserslautern is the parent club of 23-year-old German-American striker Andrew Wooten. He had spent this past season on loan at 2. Bundesliga side Sandhausen, scoring seven goals.