Northants Steelbacks will take on Essex Eagles at Friends Life t20 finals day, while defending champions Hampshire Royals face Surrey in the other last-four clash.
The draw for the semi-finals was made on Thursday evening after Essex defeated Notts Outlaws by 48 runs to book their place at Edgbaston.
Confirmation of which game will be played first is set to come tomorrow. Finals day takes place next Saturday on August 17.
Friends Life t20 semi-final draw:
Northants Steelbacks v Essex Eagles
Hampshire Royals v Surrey