(CBS) White Sox outfielder prospect Luis Robert will miss seven to 10 days with a sprained right ankle, according CSN Chicago’s Dan Hayes and other reports.

Playing with the DSL White Sox in the Dominican Summer League, the 20-year-old Robert was hurt while running the bases Monday. X-rays were negative.

A native of Cuba, Robert signed with the White Sox for $26 million in late May. He’s hitting .284 with two homers, seven RBIs and 14 runs in 24 games.

Robert is rated as the No. 45 prospect in Baseball America’s rankings.

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