The rules of the game could be changing for winning General Services Administration (GSA) contracts – and some small business advocates fear that the playing field could be tilted as well.

The sprawling federal agency, which awards work worth billions of dollars a year to businesses large and small, is reviewing its contracting procedures to "improve efficiency." But some small business advocates fear that the agency will cut small companies out of the action.

"I'm very concerned that the GSA is going to do what they've always done, which is to implement policies that will allow federal agencies and prime contractors to report contracts to large companies as small business awards," said Lloyd Chapman, President of the American Small Business League, in a statement.