De Rossi appeared on wife Ellen Degeneres' talk show earlier this month and revealed she had retired from acting.
She announced she had told Arrested Development creator Mitch Hurwitz she would not participate in season five.
'He seemed understanding and totally got it and we had a great conversation — and then he wrote me into five episodes,' she explained.
'Don’t know how it happened but I am on season five.'
Portia's inability to film the scenes on set with fellow co-star's is presumably due to her disinterest of being involved in the fifth season.