The phrase "asserted in a lawsuit" is correct and usable in written English.
It can be used when referring to claims or statements made within the context of legal proceedings.
Example: "The allegations asserted in a lawsuit were thoroughly investigated by the authorities."
Alternatives: "claimed in a lawsuit" or "stated in a lawsuit".
Mr. Johnson later asserted in a lawsuit that he deserved credit for his role in inventing the Club.
Dassault Aviation of France has asserted in a lawsuit that the bidding was not transparent and that Dassault submitted a lower bid for its Rafale jet fighter.
The former executive, Ilya Eric Kolchinsky, asserted in a lawsuit filed on Monday that Moody's tried to damage his reputation after he publicly discussed criticisms of the company's ratings model.
Mr. Payne asserted in a lawsuit filed in 2010 that he was fired for drawing attention to misconduct in city contracting; Mr. Gandhi has countered by calling him a disgruntled employee.
The educators asserted in a lawsuit filed in State Supreme Court in Albany County that Mr. Paterson had no power to withhold money after its expenditure had been authorized by the Legislature.
Alison Silva, a celebrity photographer, asserted in a lawsuit that in March 2007 he was trying to take pictures of Mr. Reeves, the "Matrix" star, as he was leaving his home, and was hit by the actor's Porsche.
The collector, Craig Robins, asserts in a lawsuit that he sold a Dumas painting through the David Zwirner Gallery in Chelsea in 2004 with an agreement that the sale remain confidential.
If a National Security Agency programme "violates Americans' constitutional rights of free speech, association, and privacy" (as the American Civil Liberties Union asserts in a lawsuit filed on Tuesday), how should we think about the roles and responsibilities of the companies involved?
Or so, at least, Citigroup is asserting in a lawsuit it filed last Friday against A.T. & T. The suit alleges that A.T. & T.'s new customer-loyalty program, "A.T. & T. thanks," infringes on Citigroup's trademarked phrases "thankyou" and "Citi thankyou," which it uses for its own loyalty program.
College athletes are employees who should be paid wages, a former University of Southern California football player asserts in a lawsuit filed against the NCAA and the PAC‑12 Conference this week.
"David Chang is a chronic liar," one of his many former lawyers, Michael S. Kimm, asserted in a recent lawsuit that, like several others by other people, claims that Mr. Chang failed to pay him what he owed.
