Twins outfielder Ben Revere will undergo a minor surgery to remove loose particles from his left knee, the Minneapolis Star-Tribune reports. Revere, who was with low Class A Beloit, hadn’t played since Aug. 18, and the announcement comes after he had returned to Minnesota to have his knee examined by a team doctor.

Revere, 20, was kept in extended spring training through most of April, but he had no problems adjusting to the Midwest League after joining Beloit late in the month. With a compact swing and a great understanding of the strike-zone, Revere maintained an average over .400 as late as July 24 and will finish the year at .379/.433/.497 in 340 at-bats. A first-round pick in 2007, Revere overcame doubts about his size (5-foot-9, 166 pounds) and has become the likely No. 1 prospect in the Twins system. He impressed with his defense in center field and his speed on the bases as well, where he was 44-for-57 in steal attempts. The announcement also comes one day after Revere was named the Midwest League’s most valuable player.