(39)On the basis of that recommendation, the Commission should be empowered to adopt, as a measure of last resort, an implementing act specifying that the third-country CCP in question should not be able to provide some or all of its clearing services to clearing members and trading venues established in the Union unless that CCP is authorised in any Member State to do so in accordance with Regulation (EU) No 648/2012. That implementing act should also set up an appropriate adaptation period not exceeding two years, which might be extended once by an additional six months, and should indicate the conditions under which that CCP can continue to provide certain clearing services or activities during the adaptation period and any measures that should be taken during that period in order to limit the potential costs to clearing members and their clients, in particular those established in the Union.