In principle it should not cause a problem. The biggest issue is that anything which gets into the amplifier input after the filter will go to the ADC. As long as you do not have a lot of high frequency interference (such as nearby radio transmitters) and you use good wiring practice (shielded cables), you should be OK.
Any interferring signals above the Nyquist frequency (half the sampling frequency) which get through the amplifier will be aliased into the sampled data and you cannot remove them by post processing. If there is any possibility of such interference, try to run some tests with no desired signal or very clean, precisely known desired signals and look for any aliasing or interference.
Lynn
