Terms were not disclosed but the St. Louis Post-Dispatch reports that the deal is worth nearly $21 million.
At 25, Oshie is among many young up-and-coming players for the Blues. He tied for the team lead with 54 points in 2011-12. He was third in goals with 19 and second in assists with 35. In four seasons, he has 63 goals and 112 assists for 175 points.
Oshie was a first-round pick (24th overall) for the Blues in the 2005 draft.