POWER OF ATTORNEY

        Know all by these present, that the undersigned hereby constitutes and
appoints each of Matthew P. Blischak of Finch Therapeutics Group, Inc., and
William Michener and Lisa Folkerth of Ropes & Gray LLP, with full power of
substitution, signing individually, the undersigned's true and lawful
attorneys-in fact and agents to:

        (1) execute for and on behalf of the undersigned, in the undersigned's
            capacity as an officer, director or beneficial owner of more than
            10% of a registered class of securities of Finch Therapeutics
            Group, Inc., Forms 3, 4, and 5 (including any amendments thereto),
            relating to the securities of Finch Therapeutics Group, Inc., in
            accordance with Section 16(a) of the Securities Exchange Act of
            1934, as amended (the "Exchange Act") and the rules thereunder and
            a Form ID, Uniform Application for Access Codes to File on EDGAR;

        (2) do and perform any and all acts for and on behalf of the
            undersigned that may be necessary or desirable to execute such
            Forms 3, 4, or 5, or Form ID (including any amendments thereto) and
            timely file such forms with the United States Securities and
            Exchange Commission and any stock exchange or similar authority;
            and

        (3) take any other action of any nature whatsoever in connection with
            the foregoing which, in the opinion of such attorney-in-fact, may
            be of benefit, in the best interest of, or legally required by, the
            undersigned, it being understood that the documents executed by
            such attorney-in-fact on behalf of the undersigned pursuant to this
            Power of Attorney shall be in such form and shall contain such
            terms and conditions as such attorney-in-fact may approve in such
            attorney-in-fact's discretion.

        The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is Finch Therapeutics Group, Inc. assuming,
any of the undersigned's responsibilities to comply with Section 16 of the
Exchange Act.

        This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by Finch Therapeutics Group, Inc., (b) revocation by the
undersigned in a signed writing delivered to the foregoing attorneys-in-fact or
(c) as to any attorney-in-fact individually, until such attorney-in-fact is no
longer employed by Finch Therapeutics Group, Inc. or Ropes & Gray LLP.

        The undersigned has caused this Power of Attorney to be executed as of
May 15, 2023.


                                   /s/ Lance E. Thibault
                                   -------------------------------
                                   LANCE E THIBAULT