PHILADELPHIA (973espn.com) - The Eagles inched closer to the NFC East title on Sunday but a 17-9 win that put the Dallas Cowboys on the brink didn't come without some casualties.

Philadelphia lost starting cornerback Ronald Darby to a hip injury while Pro Bowl tight end Zach Ertz has a broken rib, according to an NFL source.

During his day-after press conference Monday, Doug Pederson said Ertz's injury is still being evaluated and an update on will be coming later in the holiday week.

"He took the shot there in the first half and there is a rib that has been affected." Pederson said. "I am waiting with our doctors for a couple more tests for some other things. We will all see later today, and I will probably have an update for you tomorrow or by Thursday when I see you guys again."

As for Darby, Pederson did confirm that the CB will miss time and with only a must-win game in the regular season remaining at the New York Giants followed by a potential playoff game in two weeks, it's conceivable that the oft-injured Darby, a pending free agent, may have played his last game an Eagle.

"Darby is the one that's going to probably -- he's a little more significant and probably going to miss some time," Pederson said.

Pederson said Rasul Douglas will start in Darby’s place moving forward even though Sidney Jones replaced Douglas late against Dallas and recorded a PBU on Michael Gallup in the end zone which essentially sealed the game. Douglas was forced to the sideline after suffering cramps.

Philadelphia's other starting CB, Jalen Mills, suffered an ankle injury against the Cowboys and left for a bit in the third quarter but was able to return. Pederson said Mills was “hurting” on Monday and would be listed as day-to-day..

Pederson also handed out day-to-day staus to both right tackle Lane Johnson, who has missed the past two games with a high-ankle sprain, as well as receiver J.J. Arcega-Whiteside, who is dealing with a foot injury first suffered in practice last week.

"Lane is improving. He's more day-to-day. We'll see," Pederson said. "We have to get him on land, we have to get him to run and see where he's at with the ankle but he's improving.

"J.J., actually, I'm waiting on. He's going to have another test result tomorrow but should be fine. Nothing too serious there, I would expect."

-John McMullen covers the Eagles and the NFL for 973espn.com. You can reach him at jmcmullen44@gmail.com or on Twitter @JFMcMullen