BALTIMORE (AP) Astros third baseman Luis Valbuena could be lost for the season after experiencing a setback in his quest to return from a right leg injury.

Valbuena has been on the disabled list retroactive to July 27 with a strained right hamstring.

He was inching closer to a rehab assignment before hurting himself again Friday during a workout in Baltimore. He has been sent back to Houston to be re-evaluated.

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Astros manager A. J. Hinch says ''it's going to threaten his season, just based on where we are.''

Hinch added ''we're not sure what the next step will be.''

Valbuena is batting .258 with 11 homers and 31 RBIs in 86 games. Rookie Alex Bregman has taken over at third base in his absence.