October 12, 2017

FAIRFAX, VA, Oct. 12, 2017 - CGI (NYSE: GIB) (TSX: GIB.A) announced that it has been selected to participate in an indefinite delivery/indefinite quantity (ID/IQ) contract to support the U.S. Army Communications-Electronics Command (CECOM) with regards to its Responsive Strategic Sourcing for Services (RS3) requirements. RS3 carries a $37.4 billion ceiling with a 10-year ordering period (a 5-year base with a 5-year optional ordering period). The performance-based contract will provide knowledge-based program support services for command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR) organizations throughout the federal government. These services include engineering, research, development, test and evaluation (RDT&E), logistics, acquisition and strategic planning, education and training services.

Army Contracting Command – Aberdeen Proving Ground (ACC-APG), the contract administrator, provides, integrates and sustains C4ISR readiness to enable Unified Land Operations for the U.S. Army. Beyond the Army, RS3 will provide customized, best-value solutions to a diverse group of organizations that span the spectrum of C4ISR mission requirements throughout the world, including Navy, Air Force, Reserves and National Guard.

RS3 consolidates five existing or expiring Army multiple award IDIQs: Rapid Response-Third Generation (R2-3G), Strategic Services Sourcing (S3), Technical, Administrative and Operations Support Services (TAOSS), Technical Information Engineering Services (TIES) and Warrior Enabling Broad Sensors (WEBS). Nearly 400 responses were received for the RS3 opportunity by ACC-APG.

"CGI is proud to continue to support the U.S. Army with our world-class, global IT experience," said CGI Senior Vice-President Keith Quigley. "This new contract aligns with CGI's core capabilities and will allow for us to provide faster support and easier access to our IT products and services. We're proud to say that the Army considers CGI a trusted partner and we plan to continue to support the Army's endeavors throughout this contract and beyond."

About CGI Federal Inc.

CGI Federal Inc. is a wholly-owned U.S. operating subsidiary of CGI Group Inc., dedicated to partnering with federal agencies to provide solutions for defense, civilian, healthcare and intelligence missions. Founded in 1976, CGI Group Inc. is the fifth largest independent information technology and business process services firm in the world. Approximately 70,000 professionals serve thousands of global clients from offices and delivery centers across the Americas, Europe and Asia Pacific, leveraging a comprehensive portfolio of services including high-end business and IT consulting, systems integration, application development and maintenance, infrastructure management as well as 150 IP-based services and solutions. With annual revenue in excess of C$10 billion and an order backlog exceeding C$20 billion, CGI shares are listed on the TSX (GIB.A) and the NYSE (GIB). Website: www.cgi.com.

Forward-Looking Statements

All statements in this press release that do not directly and exclusively relate to historical facts constitute "forward-looking statements" within the meaning of that term in Section 27A of the United States Securities Act of 1933, as amended, and Section 21E of the United States Securities Exchange Act of 1934, as amended, and are "forward-looking information" within the meaning of Canadian securities laws. These statements and this information represent CGI's intentions, plans, expectations and beliefs, and are subject to risks, uncertainties and other factors, of which many are beyond the control of the Company. These factors could cause actual results to differ materially from such forward-looking statements or forward-looking information. These factors include but are not restricted to: the timing and size of new contracts; acquisitions and other corporate developments; the ability to attract and retain qualified members; market competition in the rapidly evolving IT industry; general economic and business conditions; foreign exchange and other risks identified in the press release, in CGI's annual and quarterly Management's Discussion and Analysis ("MD&A") and in other public disclosure documents filed with the Canadian securities authorities (filed on SEDAR at www.sedar.com) and the U.S. Securities and Exchange Commission (filed on EDGAR at www.sec.gov), as well as assumptions regarding the foregoing. The words "believe", "estimate", "expect", "intend", "anticipate", "foresee", "plan", and similar expressions and variations thereof, identify certain of such forward-looking statements or forward-looking information, which speak only as of the date on which they are made. In particular, statements relating to future performance are forward-looking statements and forward-looking information. CGI disclaims any intention or obligation to publicly update or revise any forward-looking statements or forward-looking information, whether as a result of new information, future events or otherwise, except as required by applicable law. Readers are cautioned not to place undue reliance on these forward-looking statements or on this forward-looking information.

For more information:

Lorne Gorber
Executive Vice-President, Global Communications and Investor Relations
+1 514-841-3355

Jennifer Goodman Horowitz
Director, Communications
+1 703-227-4636