Spalding United are beaten by Carlton Town in the Northern Premier League Midlands Division
Manager Brett Whaley felt his Spalding United side had produced two contrasting performances on an Easter weekend of mixed fortunes for the Tulips.
They ran out 1-0 winners on Saturday in the Northern Premier League Midlands Division match against Corby Town at the Sir Halley Stewart ground.
However, 48 hours later, play-off chasing Carlton were convincing 4-0 home winners to complete a league double over the Tulips with Whaley admitting his side hadn't been at the races.
He said: "It was a really poor performance on Monday and it showed that as a squad of players we haven't quite got the right depth.
"You have to find that depth with the two games in three days but we were little bit a short.
"Carlton are a good side and we just weren't at the races. We looked very leggy and the two performances over the weekend were the complete opposite of each other.
"We worked hard and were very effective and efficient on Saturday, but we were ineffective throughout the whole game on Monday.
"We didn't work hard enough, we didn't defend well enough and gave poor goals away. We were not clinical or creative enough at the other end either."
Spalding did welcome back goalkeeper Michael Duggan after he had missed the Corby clash while Abdul Koroma, Jack Withers, Scott Floyd, Gianluca Bucci and Gregg Smith all came back into the starting line-up.
They fell behind to Aaron O'Connor's 12th minute opener for the Millers before having their best spell of the game.
Smith hit the outside of the post with a header from a Ben Starkie cross before Floyd went close with an overhead kick.
However, the Tulips were unable find a leveller and were then hit by two goals late in the first period.
O'Connor scored his second seven minutes before the break and then Tyler Blake added a third shortly after.
Aaron Opoku then sealed the win with Carlton's fourth goal with 16 minutes remaining to drop the Tulips back down a place to 10th spot ahead of Saturday's home finale against Chasetown.
Whaley added: "We did make changes on Monday and we always knew that was going to happen with two games in three days.
"We wanted to look at the whole squad during this period of time and realistically the side on Monday didn't do itself justice.
"Carlton had everything to play for and, from our perspective, we didn't show the right mentality to be able to compete with those sort of sides."
Tulips: Duggan, Hart, Lynch (Marshall 46), Koroma (Broccoli 46), Stainfield, Withers, Floyd, Bucci, Smith, Starkie, Seymour-Shove (Adams 72). Subs not used: Cartwright, Edge.