The Orioles made a mistake when they released Miguel Gonzalez prior to the 2016 season in order to save a few million dollars of salary. They later used that money to pay Wade Miley after acquiring Miley last July, compounding the error. Gonzalez is a free agent now. The Orioles, according to The Baltimore Sun's Eduardo Encina, are one of at least three teams interested in Gonzalez.
The phrase "expressed interest" often goes unexplained in free agent reports, but in this case, Encina explains what it means: The Orioles have requested medical information about Gonzalez, a common first step in the process.