The phrase "a sole concern" is correct and usable in written English.
It can be used to indicate that something is the only issue or matter of importance in a particular context.
Example: "The company's decision to cut costs was driven by a sole concern for profitability."
Alternatives: "the only concern" or "a singular focus".
For all of the administration's efforts to call attention to the nonmilitary ties that would bind the two countries, America is still being judged by many Pakistanis as an uncaring behemoth whose sole concern is finding Osama bin Laden, no matter the cost in civilian Pakistani lives.
Criticisms of usury and apostasy in Saudi Arabia were omitted, so it sounded as if his sole concern was a showdown with the west.
So when I discovered on Aug. 19 that Paul Krugman's Op-Ed column that morning contained a sweeping assertion that was wrong in at least one respect, a formal correction was my sole concern.
According to traditional medical deontology, the sole concern of a doctor should be the welfare of the patient, regardless of costs to society [ 22].
Was it-this same mistrust that pushed Brendel and Pollini to refuse it, sometimes in a provocative manner, with interpretations whose sole concern was the search for meaning and semantics?
His sole concern is achieving an excellent result not viewing himself apart from the team (even though he clearly is a leader).
To fix Medicare, which should be our sole concern, we need an overhaul of our health system to remove the corrosive effects of the profit motive on our medical economy.
Given that health resources are finite, efficacy is no longer the sole concern when evaluating an innovation; cost-effectiveness and total cost burden are crucial when deciding whether to adopt a potentially common treatment.
When Manager Joe Girardi came out to retrieve him to a round of boos, Vazquez was his sole concern.
Race is not their show's sole concern, and they have a way of switching the familiar "race card" for something more like the whole pack fanned out.
