Jevon Carter suffered a torn right thumb ligament while participating in a skills camp run by legendary player development coach Tim Grgurich.
Carter was the No. 32 overall pick in the 2018 NBA Draft out of West Virginia by the Memphis Grizzlies.
The injury will require surgery but the Grizzlies are confident of a full return.
The Grizzlies signed Carter to a multi-year deal last month.