TV Line reports that the actors will appear in the comedy's season finale as applicants for the open office manager position alongside previously announced guest stars Will Arnett and Ricky Gervais.
Ray Romano is also due to appear, though the publication claims that his earlier commitment to Men of a Certain Age will preclude him from joining the series on a permanent basis.
Will Ferrell was previously announced to take part in a four-episode story arc leading up to Carell's exit.
Reps for NBC have refused to comment on the appearances.
Carell's final episode of The Office will air on April 28.