The 31-12 months-old has no longer made a first-group appearance this campaign and received permission to go away with a year left on his settlement.
"It changed into an honour a good way to play for this first rate membership for seven years," Buerki stated in a announcement.
"I will continually consider now not best the (German Cup very last) wins in 2017 and 2021, however all the correct and difficult times we skilled together."
Swiss 'keeper Buerki performed 232 times for Dortmund, who he joined in 2015, but misplaced his vicinity to Gregor Kobel and his final appearance changed into in May 2021. He has signed a three-12 months settlement with St Louis, where he'll link up with their German sporting director Lutz Pfannenstiel.
"We're delighted to have a pinnacle worldwide goalkeeper like Roman becoming a member of," said Pfannenstiel. "His enjoy could be a big gain."
