.....scheduled trip to Abbey Hey.
Johnson has just returned from playing in Australia and has previously played in the USA with Union College.
International clearance has been gained for the central defender.
The club have also added former Accrington Stanley professional Adam Stockdale, a versatile player who can be deployed in midfield or at full-back.
Stockdale has just recovered from a broken wrist but came through 45 minutes in a practice match in the week and will be available today.