A year on from the ‘Great Escape’ engineered by Shaun Derry, the Magpies failed to dig their way out of trouble this time round under Ricardo Moniz.
Notts replaced Derry with the Dutchman in early April but it was to no avail as the club slipped back into the fourth tier after five seasons in League One.
Moniz managed one win in his six games in charge and the Magpies went down on the last day of the season after a 3-1 defeat at Gillingham.
“In hindsight maybe we shouldn’t have been giving somebody as long as we did,” Trew told BBC Radio Nottingham.
“It was a very difficult task for him so close to the end of the season. Perhaps the club should have brought him [Moniz] in sooner.”