A restricted free agent when he left the Blues in the summer of 2014 to sign a three-year contract with Avangard Omsk of the KHL, Sobotka has an out clause following each season allowing him to return to the NHL.
Sobotka has two weeks from the end of the IIHF World Championship to let Omsk know of his decision. The World Championship ended May 17, giving Sobotka until the end of the month.
"If he decides to come back to the NHL, we'll welcome him back with open arms," Blues general manager Doug Armstrong said according to the Post-Dispatch. "And if not, we'll address it a year from now. He knows he's going to come back through St. Louis."