Koch was released from the hospital Monday, three days after getting struck with a line drive in the head while pitching for Savannah against Mario Martinez.
Koch's brother Jared of Cherokee flew out the day of the fateful game and picked Matt up at the hospital in Greenville, S.C., and drove him back to Savannah. His mother Deb of Cherokee has been staying with Matt while he recovers.
Koch, who sustained a concussion and bleeding on the brain, according to family members, has several upcoming follow-up doctor appointments and will not pitch again this season, according to a Mets official. The season ends in September.
Selected out of the University of Louisville last year, Koch is 6-4 with a 4.70 ERA in 18 appearances (15 starts) for the Gnats this season.