IDS owns UK's Royal Mail, which is loss making, and international parcels network GLS.
Royal Mail was privatised in 2013 in one of Britain's biggest state sell-offs in decades.
It is expected the commitment to offer these contractual undertakings to the British government would be reflected in the cooperation agreement between the parties if a firm offer is made, it added.
EP Group now has until May 29 to make a formal offer or walk away.
EP is a 100% shareholder in VESA Equity investment which owns Kretinsky's IDS stake of nearly 28%.
Persons:
Daniel Kretinsky, Keith Williams
Organizations:
International, Services, IDS, Royal Mail, UK's, Royal, National Security and Investment, Reuters, Equity
Locations:
Czech, London, Britain, British