"Depending on how the surgery goes, it may cost him the rest of the season," Phillies general manager Matt Klentak said.
Valentin is the organization's No. 29 prospect, according to MLBPipeline.com. He hit just .229 with a .573 OPS through 29 games with Lehigh Valley. Double-A Reading second baseman Scott Kingery is the Phillies' No. 11 prospect. He is hitting .289 with 13 home runs, 27 RBIs and a 1.018 OPS through 37 games, but he is expected to remain in Reading for the time being.
"Very possible down the road," Klentak said about Kingery's promotion.