The phrase "are rumoured to include" is correct and usable in written English.
It can be used when discussing information that is not confirmed but is believed to be true, often in the context of news or speculation.
Example: "The upcoming movie is said to be a sequel and are rumoured to include several beloved characters from the original film."
Alternatives: "are said to feature" or "are believed to encompass".
They are rumoured to include the head of Vision, Jana Bennett, one of Thompson's closest allies.
Next year's contenders are rumoured to include the sun and the sea..
The recordings are rumoured to include not only the targets, but also Pellicano's own conversations with the lawyers hiring him.
Retired names are rumoured to include the Apple Snatchers (out of northern Tasmania), the Toffee Apples (from Melbourne's south-eastern suburbs) and the grimace-inducing Rice Eaters (based in the Victorian goldfields).
And then they whittled this down to the current 12. Airlines whose CEOs will be waiting breathlessly by the phone in the months ahead are rumoured to include Qantas, Cathay Pacific and Finnair, all of them members of the oneworld alliance together with BA and Iberia.
With an actress girlfriend (currently Joely Richardson; past amours are rumoured to include Geri Halliwell) and a share in the pricey Japanese restaurant Sake No Hana in London, the pouting, tanned and stubbled Russian is a constant fixture in the society pages.
It is rumoured to include provisions that would pave the way for the coup plotters to be tried in civilian courts.
The US ambassador in Moscow, John Beyrle, described the company as being closely connected to the Kremlin, and said its "secretive ownership is rumoured to include prime minister Putin".
Considering that alternative titles were rumoured to include Exposures and The Hildebrand Rarity, the fact that the film is called Spectre comes as something of a relief.
Top of the Bill Aside from Bruce Springsteen this year's line-up is rumoured to include Crosby, Stills and Nash and Madness.
The list of actors who might get a crack at the whip is rumoured to include Bradley Cooper and the Guardians of the Galaxy star Chris Pratt.
