The phrase "already professed" is correct and usable in written English.
It can be used when referring to beliefs, opinions, or declarations that have been stated or claimed previously.
Example: "He has already professed his commitment to the cause during the meeting last week."
Alternatives: "previously stated" or "already declared".
Renzi has already professed his support for the frontrunner for the Democratic nomination, Hillary Clinton.
Having spent the past couple of years in the company of a great many wannabe MPs of my own age, many of whom have already professed that they are "definitely standing in 2020", I've been shocked by the almost complete lack of any motivation to shake up the system.
He had already professed his desire for peace, democracy and harmony.
We've already professed here how much we enjoy the droll, dry films of Whit Stillman, and his latest, "Love & Friendship," is another sparkling gem.
A large majority of Republicans already professed a belief that Clinton's health was not good enough for her to serve four years — an assertion that has been a staple in GOP campaign rhetoric and on conservative media for months.
At 68, Ms. Ashley puts herself in that category already, professing to find it quite comfortable.
An incorrigible coven at Conde Nast already professes to be bored with the 260-seat cafeteria and its leading-edge cornucopia of 60 menu items.
"He stressed the need for a deeper theological reflection on the whole issue, and called for an improved human, spiritual, academic and pastoral preparation both of candidates for the priesthood and religious life and of those already ordained and professed," the statement continued.
Of course he knew it already, but he graciously professed to share my enthusiasm.
Though he said he makes a few hundred dollars per promoting gig, Mr. Cavin professed to already being sick of the scene.
"[T]he investigators' collective statements throughout the interrogation clearly led Dassey to believe that he would not be punished for telling them the incriminating details they professed to already know," Duffin wrote in his ruling.
