"We are really excited that we are able to come to a good creative conclusion to the show", Sarandos added.
Spacey is one of several big names in the entertainment business to be accused of sexual misconduct by people coming forward in the wake of allegations against movie producer Harvey Weinstein. Spacey addressed the accusation on Twitter, apologizing for the act but saying he didn't remember it.
The show's finale is now set to focus on the character of Claire Underwood - played by Robin Wright - who, having succeeded her husband as president at the end of season five, looked directly at the camera, declaring: "My turn". Robin Wright will continue to star, but as previously announced Spacey will not be part of the last season.
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The Oscar victor was subsequently fired from the show, sparking rumours suggesting that would mark the end for House of Cards.
Killing off Spacey's character would actually follow the original United Kingdom version of House of Cards, since the Frank Underwood of that series (named Francis Urquhart) was assassinated in the final chapter of the trilogy, The Final Cut.
That left the ball in the court of House of Cards production company Media Rights Capital. Deadline reports that it will be an abridged season of eight-episodes used to wrap things up in a satisfying manner.
Sarandos spoke about "House of Cards" at USB's Global Media and Communications Conference in NY.