Exhibit 23 Consent of Ernst & Young LLP, Independent Auditors We consent to the incorporation by reference of our report dated February 19, 1998, with respect to the financial statements of the Professional Employer Organization Business of AmeriCare Employers Group included in the Current Report Form 8-K/A dated March 31, 1998 of NovaCare Employee Services, Inc. into the Registration Statement (Form S-8 No. 333-47001) and related Prospectus of NovaCare Employee Services, Inc. for the registration of 1,625,000 shares of its common stock. /s/ ERNST & YOUNG LLP Phoenix, Arizona March 31, 1998 23