It will be the first time the 19-year-old has been out on loan.
He will stay with the Brakes until 25 April and a recall has been included within the agreement once 28 days have lapsed (if required).
Truslove is a regular for Blues U21s but has yet to make his first team bow.
Blues have close ties with Leamington and Truslove is the third Blues youngster to spend time with the Conference North side this season, following in the footsteps of defender James Fry and goalkeeper Connal Trueman.
Paul Holleran's Leamington team are currently struggling in 17th spot in the table, just three places and one point above the drop zone. Their next game is a home fixture against Stalybridge Celtic on Saturday.