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               MCCARTHY TETRAULT S.R.L.        MCCARTHY TETRAULT LLP            www.mccarthy.ca

MCCARTHY TETRAULT



               July 27, 2001



               CGI GROUP INC.
               1130 Sherbrooke Street West
               5th Floor
               Montreal, Quebec
               H3A 2M8
               RE:      Registration Statement on Form S-8 of
                        8,468,287 Class A Subordinate Shares
                        OUR FILE NUMBER: 720968-281702


               Dear Sirs:

               In connection with the registration under the Securities Act
               of 1933,  as  amended  (the  "Act"),  by CGI Group  Inc.,  a
               corporation   organized   under  the  laws  of  Quebec  (the
               "Company"),  of 8,429,695 Class A Subordinate  Shares of the
               Company  without par value (the  "Registered  Shares"),  the
               following  opinion is  furnished to you to be filed with the
               Securities and Exchange  Commission  (the  "Commission")  as
               Exhibit 5.1 of the Company's  registration statement on Form
               S-8  (the  "Registration  Statement")  under  the  Act.  The
               Registered  Shares  are  to  be  offered  on  a  delayed  or
               continuous  basis  pursuant  to Rule  415  under  the Act in
               connection  with  options  granted  under the:

               1)  IMRglobal   Corp.   First  Amended  and  Restated  Stock
               Incentive Plan (as amended on July 27, 2001);

               2)  IMRglobal Corp. Directors' Stock Option Plan (as amended
               on July 27, 2001); and

               3)  IMRglobal  Corp. 1999 Employee Stock  Incentive Plan (as
               amended on July 27, 2001) (collectively the "Plans").

               This  opinion  is limited to the laws of Quebec and the laws
               of Canada applicable  therein and we express no opinion with
               respect to the laws of any other jurisdiction.

               In arriving at this opinion, we have examined such corporate
               instruments,   documents,  statements  and  records  of  the
               Company,  and we have examined such statutes and regulations
               and have  conducted such legal  analysis,  as we have deemed
               relevant, necessary and appropriate for the purposes of this
               opinion.  We have assumed the  genuineness of all signatures
               and the  authenticity  of all  documents  submitted to us as
               originals,  the conformity to original  documents of all the
               documents  submitted  to  us  as  certified  or  photostatic
               copies, and the authenticity of the originals of such latter
               documents.

               As to  certain  factual  matters  material  to  the  opinion
               expressed  herein,  we have  relied to the  extent we deemed
               proper upon representations, warranties and statements as to
               factual matters of officers and other representatives of the
               Company.

               Based on and subject to the foregoing, we are of the opinion
               that,  upon the  issuance by the  Company of the  Registered
               Shares pursuant to the exercise of options granted under the
               Plans and upon delivery of  certificates  representing  such
               Registered  Shares in the manner  contemplated  by the Plans
               and the  authorization  relating  thereto  by the  Company's
               Board of  Directors  or the proper  committee  thereof,  the
               Registered  Shares  represented by such certificates will be
               duly   authorized,    validly   issued,   fully   paid   and
               non-assessable by the Company.

               We hereby  consent to the filing of this  opinion as Exhibit
               5.1 to the  Registration  Statement  and to the reference to
               our firm in the Registration  Statement or in the Prospectus
               forming a part of the Registration Statement. In giving such
               consent,  we do not  hereby  admit  that we come  within the
               category of persons whose consent is required  under Section
               7 of the Act or the rules and  regulations of the Commission
               promulgated thereunder.

               Yours truly,

               "McCarthy Tetrault"