"Expect ILS approach", by itself is a fairly ambiguous statement.
How do you get from the holding pattern to the localizer?
Many years ago, in a galaxy far, far, away, we always stated the type of approach on initial contact with inbound A/C,
- Radar vectoring to the ILS, LLZ only, or SRA/PAR, as appropriate.
If you depart from our local airport, eastbound, it is always a DESIG SID. If you fly the route frequently, you will know this, but it is always given as an an instruction, and a read back is expected.
Anything which prevents that little mouse from completing its run through the block of cheese is O.K. in my book.