Tuiasosopo, 25, hit .226 with 14 home runs in 116 games for Seattle's Triple-A Tacoma affiliate last season, appearing at five different positions. Drafted as a shortstop in 2004, Tuiasosopo has spent much of his time in recent years at the corner-infield positions, particularly third base. He once rated as one of Seattle's top middle-infield prospects.
Tuiasosopo played in 71 Major League games for the Mariners from 2008-10, batting .176 with five homers and 70 strikeouts in 193 at-bats. His father, Manu, and brother, Marques, both played in the NFL. Manu spent five years with the Seattle Seahawks and three years with the San Francisco 49ers, while Marques played for eight seasons as a backup quarterback with the Oakland Raiders and New York Jets.
The Mets already have a full complement of infielders on their Major League roster, with Justin Turner and Ronny Cedeno slated to back up projected starters David Wright, Ruben Tejada, Daniel Murphy and Ike Davis. In addition, the Mets recently signed veteran shortstop Omar Quintanilla, who projects to back up middle-infield prospects Jordany Valdespin and Reese Havens at Triple-A Buffalo.