PHILADELPHIA (973espn.com) - The Eagles lost a bit player on Wednesday but the Dallas Cowboys may be dealing with a far bigger problem in advance of Sunday's divisional showdown at Lincoln Financial Field.

Cowboys quarterback Dak Prescott suffered a right shoulder injury in a blowout win over the Los Angeles Rams last Sunday and was limited as Dallas began its preparation for the pivotal game against the Eagles.

Cowboys coach Jason Garrett confirmed that Prescott had an MRI Monday and noted "everything seems to be OK" but also couched that with some more ominous language.

"He just banged it up and it's hard for him to function right now so don't want him throwing much in practice today," Garrett explained.

Dallas Morning News reporter Calvin Watkins noted Prescott barely moved his right arm when the team conducted jumping-jack exercises.

Prescott had already been dealing with an injury to his right index finger, along with a sprained left wrist before he suffered the shoulder problem during a first-quarter run against the Rams when tackled by linebacker Clay Matthews. He didn't miss any time in the game but reported soreness.

"He's as tough as they come," Garrett said. "His physical toughness and mental toughness are on par with anybody I've been around, and that's just what he's all about. He handles success. He handles adversity. He handles issues as well as anybody."

Prescott's backup is Cooper Rush, a Central Michigan product who has not thrown a pass last season. Former Eagles draft pick Clayton Thorson is on the practice squad.

Despite all the issues, though, Garrett is not worried about his franchise QB.

"He's a pretty tough individual," Garrett said. "He'll be ready to go."

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