Hayes was placed on the 10-day injured list Saturday with a back issue, Kevin Gorman of TribLive.com reports.
Hayes is out of the lineup for Friday's game against the Cubs.
Hayes is out of the lineup for Wednesday's game against the Angels.
Hayes went 2-for-5 with a solo home run in Saturday's win over the Giants.
Hayes is out of the lineup for Thursday's game against the Brewers.
Hayes (back) is starting at third base and batting third Friday against the Red Sox.
Hayes (back) remains out of the Pirates' lineup Wednesday.
Hayes was scratched out of Tuesday's lineup versus the Mets.
Hayes isn't in the Pirates' lineup for Saturday's game against the Orioles, Kevin Gorman of TribLive.com reports.
Hayes went 2-for-3 with a walk, a double, two runs scored and an RBI in Friday's 7-2 win over the Marlins.