Dallas Cowboys standout defensive tackle Jay Ratliff is out for at least the first six games with hamstring and groin injuries after undergoing sports hernia surgery last December.

The four-time Pro Bowl selection was placed on the reserve-physically unable to perform list.

Ratliff was out for all of training camp.

“I feel confident that he will. I believe in Jay. I think he’s a competitor,” Cowboys executive Stephen Jones said when asked if Ratliff will play at all this season. “There’s some things that can be frustrating when you have injuries. Jay has a real injury. Those things happen. I’m convinced that we’ve got a program now -- he’s had a few setbacks -- that hopefully will put him on the road where he can play for us at some point this season.”

The Cowboys cut kicker Brett Maher, quarterback Nick Stephens, wide receivers Anthony Amos, Eric Rogers and Jared Green, tight end Colin Cochart, guard Dennis Godfrey, cornerback Brandon Underwood and linebacker Deon Lacey.

Defensive end Tyrone Crawford and guard Ryan Cook were placed on injured reserve.

And defensive tackle Jeris Pendleton was released.

Follow me on Twitter: @RavensInsider

Aaron Wilson covers the Ravens for The Baltimore Sun.