When theDownton Abbeycast returns for the upcomingbig screen movie adaption, it will be without one of the series’ beloved stars:Lily James.

The actress, who starred as Lady Rose MacClare on the PBS drama, confirmed to PEOPLE that she will not appear in the Downton Abbey movie, which has officially been greenlit.

“I’m sadly not, but I’m so excited for it — I’m going to be front row,” James, 29, tells PEOPLE of not being part of the film.

“I spoke to Laura [Carmichael] not long ago and was texting Michelle [Dockery] aboutLove Islandand it’s going to be really exciting. And the whole gang is coming back,” shares James, who stars inMamma Mia! Here We Go Again, in theaters Friday.

As for why James’ character will not be featured in the film, the British star confirms that “it wasn’t schedules.”

She explains: “My character Rose moved off to New York, so it would be farfetched to bring her back.”

“I would have loved to have come back for a scene, but for a movie it can’t be like a Christmas special and it needs to be a focused storyline,” James adds, noting, “There was no space for Rose.”

James might surpriseDownton Abbeyfans inMamma Mia! Here We Go Again, which finds the actress portraying a young Donna (Meryl Streep’s character) and singing along with her group The Dynamos.

The sequel to the much-beloved film 2008 film, which is based around the music of ABBA, takes place back on the Greek island of Kalokairi five years later with Amanda Seyfried’s character running her mother Donna’s inn — with the help of her mom’s former bandmates, Tanya and Rosie (Christine Baranski and Julie Walters).

Downton Abbey.PBS

DOWNTON ABBEY “CHRISTMAS AT DOWNTON ABBEY” (2011)Credit: PBS

Downton Abbey, which ran forsix seasons, followed the lives of the elite Crawley family and the servants who worked in their country home. The period piece took place in the 20th century.

Last week, it was announced that the series would be returning as a film, with production scheduled to start this summer.

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While plot details are still unknown, Brian Percival, who directed the original series’ pilot, will direct the film.

Original cast members who are set to return includeMichelle Dockery,Maggie Smith, Hugh Bonneville and more.

source: people.com