The Spireites lost 3-1 at Scunthorpe United yesterday, a result which ended their three-year stay in the division.
Speaking exclusively to Player HD, Caldwell said: “I’m disappointed for everyone involved at the football club, but most importantly the fans.
“They came in great numbers again today and tried to back us, so it’s a big disappointment for everyone, but like any disappointment you have to look forward, next summer there has to be a massive rebuild of this football club and we have to come back stronger for it.”
A Paul McGinn own goal and two from Iron striker Ivan Toney condemned the Spireites to defeat at Glanford Park, confirming relegation with two games still to play, starting with Charlton Athletic at home on Saturday.
Caldwell is very much of the opinion that the rebuilding job starts now, and outlined what he wants to see from his players before the end of the season.
He said: “Early in game we started bright and played well, but I also want to see the mistakes cut out and I also want to see a bit more hunger and nastiness.
“I think that if you are a nice team then quite often nice teams get relegated and we’re too nice at this moment in time.”
Two changes were made to the side, following the 0-4 defeat at home to Southend United on Good Friday, and the manager explained his reasons for recalling both Rai Simons and David Faupala in place of Dan Jones and the suspended Dion Donohue.
However, those plans had to be revised when Simons went off injured in the first half.
“We tried to be a threat in the channels, with the strikers playing out wide and Rai [Simons] running off the strikers with his power running through,” Caldwell said.
“I thought in the first 20 minutes of the game, we were very much in the game, and we had great opportunities on the counter attack, and too often they peter out in to nothing, when it should at least be a shot or an effort at goal.
“And the first goal is a poor goal, we should defend the front post, and then deal with it in the middle if it does get through, but once that goes in you could see the confidence drain from the players – as has happened too many times – and we struggle after that.
“In the second half they stuck at it, without really creating a lot and played better, but as has been the case too often, it’s too little too late.”
In an otherwise difficult afternoon there was one bright spot to come from the day, and that was the introduction of 16-year-old Charlie Wakefield in the closing stages.
Wakefield has impressed in reserve and youth team games this season and Caldwell believes the young midfielder has a bright future at the club.
He said: ““I think at any time where you are in a difficult period there is some hope and that is the young players that we have at the club, Joe [Rowley] again played well in a difficult afternoon, and to get Charlie on the pitch was great.
“His quality on the ball, he’s a really elegant player and left footed, which is always good to have. And we’ve also got Jack [Brownell], so we have good young players and it’s a big summer for them to push forward and get their place in the first team.”
Meanwhile Caldwell issued a message to the Spireites faithful, many of whom travelled to North Lincolnshire for the match. It was a message that things will change for the better.
“Stay with us, I will turn this around,” he added.
“I know it’s disappointing but in the summer there will be a big turnaround in players and there will be a big turnaround in mentality.
“I believe in my staff, and I believe in the club that we can turn this around and come back stronger.”