Hayes was removed in the top of the eighth inning of Sunday's game against the Cardinals with right hand discomfort, Mike Persak of the Pittsburgh Post-Gazette reports. He went 1-for-3 with a run before departing.
Hayes previously missed two months early in the season with a left wrist issue, but it was his other hand that nagged him Sunday. The Pirates are likely hoping that with the benefit of a team off day Monday, Hayes will be ready to return to action Tuesday against the White Sox.