OXNARD, Calif. -- Dallas Cowboys linebacker Andrew Gachkar returned home to have surgery on a broken thumb suffered in Thursday’s practice.

He is likely to be ready right around the Sept. 11 season opener against the New York Giants. Coach Jason Garrett said the injury occurred in seven-on-seven drills in which a pass caused a small break that required the operation.

He is the second Cowboy forced to return to Dallas for surgery, joining quarterback Kellen Moore, who had surgery Wednesday to repair a broken right fibula. He is expected to miss 3-4 months.

With Rolando McClain on the reserve/did not report list, Jaylon Smith and Damien Wilson on the non-football injury list, Kyle Wilber battling a sore back and Sean Lee sitting out of Friday’s practice, per coaches’ orders, the Cowboys are down to seven linebackers on the 90-man roster.

Veteran Justin Durant, who signed before camp, has not taken a full workload of snaps in practice yet.

Wide receiver Devin Street has a sore back, which he strained in Thursday’s practice.

In addition to Lee, Tyron Smith and Barry Church will not practice later today. Tony Romo, Dez Bryant and Jason Witten will return to practice after they had Thursday off.