Pittsburgh Steelers rookie center Zach Frazier suffered an ankle injury on Sunday, and his status has been revealed.Per NFL insider Jordan Schultz, Frazier is considered week-to-week since there’s no structural damage to his ankle. Frazier left Sunday’s game against the Las Vegas Raiders after a defender fell on his leg. Backup center Ryan McCollum replaced him after he went to the sideline tent, and it was reported that Frazier was in a walking boot after the game. Frazier was selected by the Steelers in the second round of this year’s draft after playing college football at West Virginia. He…