The chairman of the joint parliamentary oversight committee on the NBN Rob Oakeshott says workforce-related issues arising from the $11 billion Telstra-NBN Company deal might add to the cost of the national broadband network roll-out.

The NBN Company expects to make its purchasing decision for two satellites for the national broadband network within the next "couple of months" before turning its attention to finding a supplier for its earth-based satellite services.

The powerful joint parliamentary committee overseeing the roll-out of the national broadband network will scutinise the $11billion deal between Telstra and the NBN Company, looking at questions of risk and value for money.