The Padres designated Johnson for assignment Friday.
San Diego needed to clear a spot on its active roster for the return of Xander Bogaerts from paternity leave. Johnson has managed a lowly .178/.229/.222 slash line in 32 games as a part-time outfielder for the Padres this season. There's a good chance the 30-year-old clears waivers, and if that happens he would have the ability to elect free agency.