Chris Gragg and Dominique Jones may not be familiar names for even the most loyal soldiers of Bills Mafia, but fans watching Sunday night’s preseason opener against the New York Giants can expect to see plenty of them.

Gragg and Jones are the only healthy tight ends on the Bills’ roster after Lee Smith joined Scott Chandler and Tony Moeaki on the sidelines for Thursday’s practice at St. John Fisher College. Smith has a lower-body injury, coach Doug Marrone said afterward, while Chandler has been out since Sunday with a groin injury and Moeaki is sidelined by a hamstring problem.

Gragg also missed time earlier in camp after heat-related cramping issues left him hospitalized for two days. But Marrone said afterward he’s hopeful the second-year tight end will be ready for a full workload against New York.

“I hope so. He did a good job today coming back,” the coach said.

Offensive lineman Chris Hairston, who left Wednesday’s practice with a back injury, did not participate Thursday. Starting left guard Chris Williams suffered a toe injury during practice and did not return.