McGlynn broke into the Derry side at the age of 17. He made his debut in April 2001 in a 1-0 home victory over Kilkenny City with his first goal for the club arriving 10 days later during a 3-3 draw with Shelbourne.
McGlynn joined the Derry side at age 17 and made his debut in April 2001, scoring his first goal for the club in a home victory over Kilkenny City on April 2001. He scored again ten days later during a 3-3 draw against Shelbourne.