Hennessey - the highest capped international whilst representing Palace - will join Wales as they prepare to face Azerbaijan and Belarus on the 6th and 9th September.
Van Aanholt last formed part of the Netherlands' squad as they overcame England in June. This month, the Dutch will face Germany and Estonia - the former of which they lost to in March this year. Ronald Koeman's men will also play on the 6th and 9th September respectively.
Stay tuned on cpfc.co.uk, the official app and across our social channels for updates on how they fare!