Wang was non-tendered by the Nationals late last month, but indicated to his agent, Alan Nero, that he wanted to stay with the club because of the way it treated him while recovering from right shoulder surgery.
Wang hasn't pitched in a Major League game in almost two years because of foot and shoulder problems. He did pitch in the Instructional League this fall and didn't have any problem with the shoulder.
Wang is best known for his years with the Yankees, winning a combined 38 games in 2006 and '07.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.