The Sabres have already improved their defense. They're giving Cody Goloubef a chance to make it better. Buffalo has signed Goloubef to a professional tryout contract, the team announced Tuesday. The 27-year-old defenseman has 129 games of NHL experience with Columbus and Colorado. Goloubef played 33 games for the Avalanche last season, recording five assists and a minus-11 rating.