Sportsnet.ca -- Sportsnet has learned the Buffalo Sabres recently made a formal offer to Brian Campbell that the all-star defenceman rejected.

Sources said the Sabres were set to make Brian Campbell among the top-paid defenceman in the league but the stumbling block remained the length of the deal which was believed to be only in the three-year range.

Campbell, who will become an unrestricted free agent on July, has recorded four goals and 37 assists this season.