Oleksuk had 19 goals and 21 assists in 74 games last season with Worcester of the AHL.
The Sharks also announced Friday that former forward Niklas Sundstrom has been hired as a European scout and several other changes to the front office.
Mike Ricci will work on the development of the team's forwards throughout the organization and Bryan Marchment will have a similar role for defencemen. Scout Dirk Graham will also work in the player development process with an emphasis on leadership and character development.
You know what? We've played in some pretty special buildings along this playoff run so far. You start in Detroit, you go to Montreal, you come here … I think it's the first team to beat three Original Six teams to get to the Final if I'm not mistaken. That says how tough the road has been. Those are tough places to win.
— Lightning forward Steven Stamkos after Game 7 win vs. Rangers on Friday in New York