"reluctantly acknowledge" is correct and usable in written English
You can use it when referring to something that is accepted reluctantly, or with some hesitation. For example: "The President reluctantly acknowledged the need for greater oversight of government departments."
Still, even foamers reluctantly acknowledge that the cars have become a bit obsolete.
I have since become more careful, and reluctantly acknowledge that the world probably won't be saved through consumerism.
Yet even the real Uncle diehards might reluctantly acknowledge that perhaps there is something in the books themselves that limits their appeal.
Like him or not, some diplomats reluctantly acknowledge, Bashir negotiated the 2005 peace deal which ended two decades of civil war between north and south Sudan.
At that point, Selig will reluctantly acknowledge Bonds as baseball's new home run leader, reluctantly because he doesn't want to honor a steroids-set record.
They also brought a cultural shift for residents in border cities like El Paso and its twin, Ciudad Juárez in Mexico, metropolises so intertwined that they only reluctantly acknowledge the international dividing line between them.
"All the [producers] have got these mandolins, it's the new craze," says Capper, reluctantly acknowledging an east London fad.
When I asked Fields about this, he reluctantly acknowledged that he might well have suggested the meeting.
Mr. Kostin, MDM Bank's deputy chairman, reluctantly acknowledged the existence of the ploy but said it was not used anymore.
Google responded to negative coverage this week by reluctantly acknowledging and then removing offensive autosuggest results for certain search results.
Labour reluctantly acknowledged this last year, soon after Miliband unveiled the fund as the highpoint of a party conference speech, which is remembered more for his amnesia.
