IRVING, Texas -Despite returning to action with one of his best games of his career, Phil Costa is again on the injury report.
This time, the starting center has a left knee injury that has him limited in practice.
The Cowboys already have veteran backup Ryan Cook on the injury report with a hamstring injury that kept him out of last week's game with the Ravens.
It's unclear what the Cowboys would've done at center had both Cook and Costa finally been healthy. Cook replaced Costa after three plays in New York when Costa's back injury flared up again, forcing him out the rest of that game and the next three.
Cook filled in admirably, considering he joined the team only five days before the opener. But Cook then suffered a hamstring injury late in the game against the Bears and has been sidelined in practice.
Second-year pro David Arkin has been active the last few weeks backing up either Cook or Costa. The Cowboys have yet to have both players active since the opener against the Giants.
Costa's back issues were a big problem in training camp, keeping him out of the first three preseason games. He returned for the preseason finale against the Dolphins where he was the only regular starting suiting up, just to get him some work before the first game.
While Costa did well in that contest, he played only three snaps before the back flared up again in New York.
The Cowboys also could get Kevin Kowalski back in the mix soon. Kowalski has been on PUP (Physically Unable to Perform) since the start of the season and is now eligible to practice although he did not on Wednesday. The Cowboys now have a three-week window for him to practice before having to decide whether to put him on injured reserve or activate him to the 53-man roster.
