Hayes (hand) is expected to either hit the injured list or return to the lineup by the end of the weekend, Alex Stumpf of DKPittsburghSports.com reports.
Hayes hasn't played since Sunday while battling a bruised hand. He was able to swing, field and throw Saturday, so it seems possible that he'll be able to play soon, but the Pirates have little incentive to risk anything with the talented young third baseman given that they're nowhere near the playoff race.