The phrase "allegedly concerning" is correct and usable in written English.
It can be used when discussing claims or accusations that are reported or believed to be true but have not been proven.
Example: "The report included details of the incident, allegedly concerning the misuse of funds by the organization."
Alternatives: "reportedly related to" or "purportedly about".
Ansa reported that he used a pseudonym because he was allegedly concerned for his safety.
The revelations allegedly concerned the Red Brigades' kidnap and murder of Aldo Moro, the Christian Democrat party chairman, the previous year.
But we know what Jackson said on Wednesday: "that the anarchists that are coming in, the people that don't want healing, the people that just want to continue to fight" are the people he's allegedly "concerned about".
The perjury allegedly concerned the payment of money to have the city commission "defeat or at least delay" a building applica tion by a competitive real‐es tate operator.
Allegedly concerned exclusively with issues related to Israel, AIPAC's lobbying reaches far and wide.
The unreleased recording allegedly concerns the leadership of ACT and disparaging remarks about elderly New Zealand First supporters.
"Several federal and state authorities in Brazil have launched investigations which allegedly concern Alstom among other companies, but none of these investigations has legally concluded on any charge against Alstom," the Alstom spokesman said.
The manager refused to confirm newspaper suggestions that the midfielder is set to be fined two weeks' wages following the player's latest off-field indiscretions, which allegedly concern an all-night party at a Birmingham hotel on Saturday evening, or that the midfielder will be dropped but did reveal his disappointment following the latest publicity.
Contostavlos faced trial for allegedly being concerned in the supply of the class A drug with Mahmood as the main prosecution witness, a jury heard.
