According to the Warming Glow blog, an unnamed source has confirmed that a former Arrested actor "has already been chosen" to play the new office boss and is currently "being shown the ropes".
However, the source did not confirm the name of the actor allegedly hired for the part.
Arrested Development - cancelled by Fox in 2006 - starred Jason Bateman, Will Arnett, David Cross, Jeffrey Tambor and Tony Hale.
The source also alleged that Eastbound & Down star Danny McBride, previously reported to be in line to replace Carell, is not being considered for a permanent role, but "will show up at some point throughout the series".
A new season of The Office will begin on NBC on September 23.