The phrase "admitted concern" is correct and usable in written English.
It can be used when acknowledging or expressing a worry or issue that has been recognized or accepted.
Example: "During the meeting, she admitted concern about the project's timeline and its potential impact on the team's workload."
Alternatives: "expressed worry" or "acknowledged apprehension".
In a televised speech, he admitted, "Concern for our soldiers forces us to let go of some areas".
While James flatly admitted concern over his teammates' struggles Saturday night, Wade wondered aloud about the Heat's division of labor, which sounded like a veiled plea for James's trust.
Manager Joe Torre was the first to express the emotion after Chicago pounded the Yankees, but Paul O'Neill followed Torre, Derek Jeter admitted concern and David Cone conceded that it was true.
Photograph: BRIAN SNYDER/REUTERS James Bullard, president of the St Louis Fed, has admitted concern over rising 10-year bond yields which hit a two-year high on Thursday: I think it is a concern, but I think the level of yields now is still quite low by historical standards.
UPDATE: During his visit to Wheat Ridge 5-8, Sen. Bennet admitted concern that his proposed reforms to No Child Left Behind do not go far enough in assigning accountability, but says it's a lesser evil to leaving things status quo according to the Associated Press.
More claims of sexual assault and impropriety have been made against former teachers at a prestigious Manchester music school as one of the school's trustees admitted "concerns run deep" among the institution's management.
Most reported that they did not feel obliged to respond, and none admitted concerns that their responses may influence subsequent care.
However he did admit concern over the alienating effect Britain's war on terror was having on the UK's younger Muslim community.
The Duke of Westminster has sold £240m of prime properties in central London over the past 12 months, his property company revealed yesterday, after admitting concern over escalating prices.
Manchester United's derby with Manchester City on Monday in Beijing is in doubt due to torrential rain and heavy flooding with the organisers of the International Champions Cup admitting concern about the game going ahead.
Jones admits concern over Priestland's state of mind, but believes the 25-year-old can handle the pressure.
