PEORIA, Ariz. -- The competition to be the Mariners' backup first baseman was reduced by one on Thursday when the team sent Mike Carp to the Minor League complex.

The 23-year-old left-hander, who split last season between the Mariners and Triple-A Tacoma, will begin the 2010 campaign with the Pacific Coast League team.

His departure was not a surprise.

Casey Kotchman, acquired from the Red Sox during the offseason, will handle the bulk of playing time at first base with several potential candidates still in the running to be the primary backup -- Ryan Garko, Mike Sweeney, Matt Tuiasosopo, Jack Hannahan (currently sidelined with a strained right groin) and Ryan Langerhans.

An outfielder throughout his career, Langerhans has been taking grounders at first base but has not played the position in a Cactus League game.

Carp, acquired from the Mets prior to last season, played in 13 games this spring, batting .188 (3-for-16) with two RBIs.

He had a solid 2009 campaign, batting .271 with 15 home runs and 64 RBIs in 110 games with Tacoma and .315 with one home run and five RBIs in 21 games with the Mariners.

In another transaction on Thursday, the Mariners acquired Minor League infielder Edgar Trejo from the Brewers for an undisclosed amount of cash.