The move to call up Hoerner, 22, comes with shortstops Javy Baez and Addison Russell dealing with injuries.
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In 70 games at Double A Tennessee, Hoerner hit .284 with three home runs, 22 RBI and a .344 on-base percentage. He was the Cubs first round draft pick in 2018, getting selected 24th overall.
Baez, 26, is seeing a hand specialist Monday after suffering a hairline fracture in his left thumb and potentially could miss the rest of the regular season.
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Russell was hit in the face by a fastball Sunday against the Milwaukee Brewers and is in concussion protocol.
The Cubs are in San Diego, where they will take on the Padres Monday night.