Vanek and Moulson are set to become an unrestricted free agent this summer. The Islanders sent a 2014 first-round pick and a 2015 second-round pick to the Sabres in the deal.
Vanek, 29, has four goals and five assists in 13 games. He has a cap hit of US$7,142,857 for the rest of the season.
Moulson, 29, has six goals and three assists in 11 games. He has a cap hit of US$3.133 million.
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