Nearing the end of a disappointing season, the Braves could fire GM Frank Wren, CBS Sports’ Jon Heyman writes, noting that the Braves’ collapse appears “sure to lead to some sort of significant change.” Manager Fredi Gonzalez’s job does not appear to be in danger at this time, Heyman adds.

These aren’t the first rumblings that the Braves’ front office might be in for a shakeup. Earlier this week, it emerged that the Braves might have either senior advisor John Hart or president John Schuerholz take an increased role in baseball operations. There have also been indications that, if Wren loses his job, the team might look to former Braves assistant GM and current Royals GM Dayton Moore, although Heyman suggests that’s unlikely. Earlier today, MLB.com’s Mark Bowman wrote that the Braves could consider dismissing Wren and/or Gonzalez “within the next few days.”

If the Braves were to fire Wren, they would likely turn to assistant GM John Coppolella, who would take the job on an interim basis and be mentored by Hart. Bowman writes, however, that Hart enjoys working as an MLB Network analyst and would not be interested in taking a full-time role with the Braves.

It’s been a tough September for the Braves — they’re currently 4-14 for the month and have fallen three games below .500. After spending much of the year in playoff contention, they were mathematically eliminated from the race today. Over the course of the season, the Braves have struggled with a weak group of position players, getting little from hitters like B.J. Upton, Dan Uggla, Ryan Doumit and Tommy La Stella, the first two of whom Wren signed to expensive long-term deals. If the Braves were to dismiss Wren, he would be the third GM fired or reassigned this year, following Josh Byrnes of the Padres and Kevin Towers of the Diamondbacks.