According to Darren Dreger from TSN, the Flames have contacted the Leafs about defenseman Jake Gardiner. He also named the Islanders as a team that has contacted the Leafs. The Leafs are reportedly asking for a top 6 forward in exchange for Gardiner.
Through 26 games this year, Gardiner has registered 6 assists with no goals and is a +2. As a rookie in 2011/2012 Gardiner had 7 goals and 23 assists in 75 games.
I would seriously consider trading Michael Grabner for him. Gardiner is still young at only 23, and is measured at 6'2 184 pounds which would add much needed size to the Islanders defensive core.