Mets want Sierra for a reason

At MLB Trade Rumors, they talk about the Mets and why they want to sign Rubin Sierra:

The Mets continue to believe in Rubén Sierra's ability to help shape young players and are negotiating a minor league contract with the 41-year-old slugger. The Mets have no immediate plans for Sierra to make the major league team out of spring training, but he will be in their system if the need arises for a veteran hitter.