Chris Wilder believes the majority of his squad will feel like established Championship players now, following a full season back in the second tier.
Speaking following the return to first-team action of Kieron Freeman against Preston North End on Saturday, the boss remarked: "Kieron Freeman gave it a right go for the time he was on the pitch and although George (Baldock) was disappointed he took it the right way and reacted positively.
"I want disappointed players when they aren't selected and George, along with the likes of Fleck, O'Connell, Stevens, Duffy, Brooks has enjoyed an excellent first full season in the Championship.
"We felt Kieron does just that bit more in the final third, he ran out of steam towards the end, but he put a right shift in and got in some decent positions."
Wilder added: "The players have got this season on their CV now and none of them have looked out of place in this division.
"We've had some fantastic experiences as a team and I hope the supporters have enjoyed the ride.
"We are down and disappointed, we believed earlier this season we could achieve something and make a real mark, but we've fallen just short.
"We've got a foot hold in the division though, I want us to improve and get better and I want to take us forward."