The 25-year-old has signed a four-year contract and joins Werder Bremen for an undisclosed fee.
“We are pleased that we were able to convince Selassie to join us despite having several other offers,” Werder Bremen sporting director Thomas Schaaf told the club’s official website.
“He is a very talented right-back who confirmed our good impression of him with some good performances at the European Championship.”
“The decision to join Werder Bremen was the right thing to do,” he added.
“This is a club with a lot of stability and tradition, who always set their goals high. I would like to emulate here my successful season at Liberec.”