Van Riemsdyk left Sunday night's 6-2 victory over Dallas with a leg injury. The rookie has one assist in 18 games.
The 25-year-old Raanta was sent to Rockford to get some work ahead of Chicago's upcoming six-game road trip. He is 1-2 with a .933 save percentage and 2.03 goals-against average in three games this season with the Blackhawks.
Chicago announced the moves on Monday.