Neil Aspin believes yesterday's defeat to Cambridge United shows how much work the club has to do in the summer to improve next season.
The Valiants fell to a disappointing 5-0 defeat at The Abbey Stadium yesterday.
Aspin believes the player's just were not good enough on the day.
"I'd sum it up by saying it was a diabolical performance, it sums up the season.
"It shows just how much work we've to do to get the team and the players to a level where we can be competing in this league.
"What hurts me the most is the lack of fight and determination that was evident today."
The manager also spoke about his own personal desire to be back on the pitch to help his side.
The manager expressed how tough it is to watch from the touchline and says it makes him reminisce to his playing days.
"I know it's tough for the supporters but believe me, it's bad for me on the sidelines.
"You remember when you used to play, wanting to kick every ball.
"Those days are gone though, and my job is to get players in who will perform better than they did today."
Overall, the manager believes this season is one to forget for everyone involved at the club.
Vale ended the season finishing in 20th position, only one point above the relegation zone.
Aspin is happy he kept his side in the league, but knows there's much to improve on next season.
"A lot of people will be hurting tonight, myself included, but we've got to forget this season.
"It's not been good enough, it's been tough for the supporters, I accept that.
"The aim was to keep the team up though, and we've done that."