The Twins promoted Arraez from Double-A Pensacola to Triple-A Rochester on Tuesday.
Arraez will assume the roster spot of another well-regarded infield prospect in Nick Gordon (thigh), who was placed on the 7-day injured list. Over 164 plate appearances at Pensacola this season, the 22-year-old slashed .342/.415/.397 while going 3-for-6 on stolen-base attempts.