The phrase "already contended" is correct and usable in written English.
It can be used when referring to something that has been argued or asserted previously in a discussion or debate.
Example: "In the previous meeting, I already contended that our approach would yield better results."
Alternatives: "previously argued" or "already asserted".
After all, several pro-government speakers had already contended that the motions were almost indistinguishable.
His political opponents have already contended that it was unconstitutional for him to continue governing from abroad.
That would be an aggressive approach, however, and the I.R.S. has already contended that the law bars such a double-barreled benefit.
Some of the freed Americans had already contended this month that they were misled by Ms. Silsby, who had faced more than a dozen legal complaints connected to her online shopping business before she persuaded fellow Baptists from Idaho to assist her in setting up an orphanage for Haitian children.
In his 1907 essay "Zwangshandlungen und Religionsübungen" ("Obsessive Acts and Religious Practices," later translated as "Obsessive Actions and Religious Practices") Freud had already contended that obsessional neuroses are private religious systems and religions themselves no more than the obsessional neuroses of mankind.
As if to prove that there are no supernatural forces working against Peter Jackson's "Hobbit" movies, for which that director has already contended with a labor dispute, the occasional explosion and emergency ulcer surgery, the studios have settled on some interesting release dates for the two-part fantasy epic.
Many here already contend the future belongs to China.
"All is Lost" is one of four already contending for the Oscars in March.
We are taking our country back.' " Christians in Pakistan already contend with deep-rooted prejudice.
But New York already contends with an unwanted population of Wall Street finance types, argues Hamilton Nolan.
This may sound like a minor problem; authors already contend with an enormous domestic market for secondhand books.
