First Minister Carwyn Jones has met BBC Trust chairman Lord Patten over cuts to BBC Wales.
The Welsh Government has already raised the issues of the future of BBC Wales and changes to S4C with the UK Government.
The First Minister said: “There are major implications arising from changes in the funding arrangements of S4C and possible reductions to the BBC’s budget.
“When it comes to BBC Wales, I have told Lord Patten of our worries over proposed cuts to its output. I want to see full disclosure of the scale of cuts and changes currently being considered by the Corporation.
“BBC Wales is one of the most powerful institutions in Wales, with 1,200 direct employees. It is by far the biggest player in the Welsh market for television, radio and on-line services. It is essential that Wales’ elected representatives are fully involved in any changes that may fundamentally alter it. We must maintain the widest possible range of BBC services in both Welsh and English.
“S4C is another issue of concern. The channel plays a very important role in the cultural life of Wales. The UK Government’s proposals that S4C funding should become the responsibility of the BBC have far reaching importance for Wales and the Welsh language.
“It is essential that the editorial and operational independence of the channel continues and its funding put on a long-term, secure footing. And we also believe that there should be a fundamental review of S4C in order to inform the shape of the channel in the future.”