Hayes (upper body) was placed on injured reserve Monday.
Hayes (upper body) has been downgraded to week-to-week by coach Mike Sullivan, per Michelle Crechiolo of the Penguins' official site.
Hayes (upper body) won't play Friday against Washington, according to Tom Gulitti of NHL.com.
Hayes (upper body) will be absent from the lineup versus Carolina on Thursday, per Penguins play-by-play announcer Josh Getzoff.
Hayes missed practice Wednesday and is being evaluated for an upper-body issue, Penguins play-by-play announcer Josh Getzoff reports.
Hayes was traded to Pittsburgh on Saturday, reports Sportsnet's Elliotte Friedman.
Hayes (illness) is likely to return to the lineup Thursday in Nashville, per Lou Korac of NHL.com.
Hayes is dealing with an illness Wednesday and is questionable for Thursday's game against Nashville, per Lou Korac of NHL.com.
Hayes notched a goal and an assist in Monday's 5-1 win over the Bruins.
Hayes scored two goals in Tuesday's 6-4 loss to the Red Wings.