He told the Nottingham Post: "We have taken the decision to pull out of the reserve league so that we can concentrate on the youth set-up and the first-team squad.
"Young lads have been coming up through into the first team and we finished the season with four 17-year-olds in the squad.
"We want to test players at the highest level possible and that is what we did last season and there will be games for others not involved."