The U.S. striker will temporarily train with the Bundesliga side, which is already home to fellow American forward Aron Johannsson.
U.S. international Jordan Morris will train with Werder Bremen next week, the Bundesliga club has confirmed.
"It's an opportunity for us to get to know the player better. Nothing more and nothing less," club CEO Thomas Eichin said in a statement.
After leading Stanford to the NCAA title last month, Goal USA reported the 21-year-old will forego his senior season to turn pro and is in advanced negotiations with the Seattle Sounders on a contract that will make him the highest-paid homegrown player in MLS history.