McDonald scored his first goal for the club since signing from Dartford against Cardiff in midweek and Gunn believes there are more where he came from.
He said: "It's something John Deehan and I talk about regularly.
"You get recommended players from different avenues all the time whether it be from your own scouts or from agents.
"In this day and age even non-league players have agents because those agents know there a few diamonds out there."
Source: Team_Talk