Strong questions are being asked just days after the Government announced it would try to facilitate more Australian health workers helping the fight against Ebola in West Africa.

It was revealed earlier this week that Aspen Medical has been awarded a $20 million contract to run a British army-built field hospital in Sierra Leone.

The deal has caused anger among many non-government organisations, who say they have been ignored in favour of a company with little experience dealing with the virus, or operating in Africa.

But the claims of inappropriate favouring go deeper, as reporters discovered that since 2007, Aspen has been given more than $200 million worth of government contracts from the Department of Defence alone.

But many want to know why Australian Medical Assistance Teams (AUSMATs) have not been included in Australia’s Ebola response in Africa.

Part of official AUSMAT documents state that the health emergency teams should be “capable of responding both nationally and internationally.”

Victorian Greens Senator and public health specialist Richard Di Natale says Aspen will have to reach out to NGOs in Africa if it is to be successful, and AUSMATs should be considered.

“That's the whole point of having an AUSMAT team - to have people with the skills and qualifications who can go to the field and can ensure that they're the first responders,” Senator Di Natale told reporters on Thursday evening.

“We need to ensure that AUSMAT health professionals are deployed to West Africa not simply because they're the most appropriate people to respond in instances such as this, but if there was to be an outbreak, for example in our region... then it would be the AUSMAT team that would be deployed, and without that field experience it potentially exposes us to serious risk.

“To simply outsource this to a private medical company and to do that without what appears to be the necessary qualifications, in terms of training and experience that will be provided to other health workers who will be working for NGOs, that have got a long experience in this area, does raise some serious questions. It's absolutely certain,” he said.

“I would be very concerned if Aspen essentially made the decision to deploy people directly to the field without working with the existing NGO community deployed in West Africa.”

But Aspen has been running a clinic in Liberia's capital Monrovia, about 350 kilometres from Sierra Leone, since several months before the Ebola outbreak.

Aspen managing director Glenn Keys has told the ABC that the organisation has some experience already.

“We were approached because we were already on the ground. We're in Liberia - we have been for a number of months,” Mr Keys said.

“We opened up before the Ebola outbreak occurred. So we've got good experience in north-west Africa, and there's not a lot of Australian companies that do.”

Australian Medical Association (AMA) says it wants to meet with Aspen to ensure their training is of a high enough standard.

AMA president Associate Professor Brian Owler he needs to know that staff – African locals and Australians - are well-versed in the proper use of personal protective equipment, understand the conditions, and the things they will confront.