"a further concern" is a correct and usable phrase in written English.
It can be used to introduce a new or added worry or issue within a sentence. For example: "A further concern is the potential impact on the environment."
A further concern I have is the way the project is reported by the Guardian.
A further concern was that the current definition made no reference to social work theory or indigenous knowledge.
A further concern we have is that commissioning as proposed has never been tried and tested elsewhere.
A further concern was the case last year of Abbey's call centre staff who were selling its customers' bank details in an underpass near Bradford.
A further concern: Organic producers disavow genetic modification, which can be used to improve a crop's nutritional content, enhance resistance to pests and diminish its need for water.
A further concern, in Belgium and elsewhere, is that young volunteers will return to Europe radicalized by their experiences, posing a potential terrorist threat to their own countries.
A further concern is that a wave of acquisitions has left much of the seed business and most agricultural biotech patents in the hands of five big companies: Monsanto; Syngenta; DuPont, which bought Pioneer Hi-Bred; Dow Chemicand Aventisntis.
A further concern is that once that information was in the hands of US authorities, which are not bound by the European human rights convention, there would be no barrier to it being passed to Afghan authorities.
A further concern is price.
A further concern is that it is uneven across regions and socioeconomic groups.
A further concern over clinical application is the stability of the models used.
