Prized White Sox Cuban outfield prospect Luis Robert has been sidelined with his second injury of the summer, suffering a sprained right ankle while running the bases in a Dominican Summer League game Monday.

Robert, 20, is expected to miss 7-10 days, the Sox said. X-rays on the ankle were negative.

The 26-ranked prospect in baseball and No. 4 on the White Sox list according to MLB.com, Robert also suffered an injury to his left meniscus a month ago and returned to action only recently.

Robert signed a $26 million bonus in May and cost the Sox an additional $26 million in tax for exceeding their international bonus pool.

Robert has performed well when he’s been on the field, hitting to a .284/.500/.463 slash line with two home runs, six doubles and seven RBI over 24 games and 96 plate appearances with 11 stolen bases bases.

Robert is expected to finish the year in the instructional league in the Domincan and is not expected to be in Arizona until spring training.

“He’s done very well in the short period of time he’s been able to play, but between the knee and ankle he hasn’t got to play for six, eight weeks straight,” Hahn said. “Hopefully he’s back in 7-10 days, he will finish the year out in the DSL. I suspect he’ll be part of the DSL instructional league and we’ll see where he’s at come next spring training.”