Sheffield United manager Danny Wilson admitted Yeovil deserved their 2-0 win at Bramall Lane, which came following two second-half goals from Paddy Madden.
Madden fired low past George Long after being set up by Byron Webster four minutes after half-time and was then rewarded for his tenacity in the 66th minute, walking the ball into the net after catching the keeper in possession.
Wilson said: "It was really disappointing. Throughout the game, there were too many opportunities where we didn't play as well as we can. Our defensive work has been average at times and we never really got a head of steam up, apart from just after half-time, before we conceded a second goal.
"I thought at that point that we might just get back into the game but we gave too many chances to them. In the first-half we were second best to the ball and we always seemed to be chasing the game.
"To be fair to them, we were chasing opponents who were getting to the ball quicker than we were and that was typical of the game. For the second goal, I think he (Long) has made a decision to play the ball out to Marcus (Williams) and all of a sudden he's been pressed and taken his eye off the ball.
"Credit to Madden who has run about 30 yards and walked the ball in. It happens and in a key area like George is playing in, mistakes generally get punished. I'm taking nothing away from George who has been fantastic for us."
Yeovil manager Gary Johnson heaped praise on his players after their win took them up to eighth in the League One table, just a point away from the play-off spots.
"He said: "I thought it was a fantastic performance. It was a colossal performance from our back players - a real clever, strong-running performance by our midfield four and our front two worked their socks off.
"Paddy's never-say-die running got us the two goals and we had chances in the first-half. I said at half-time that we'd go away really disappointed if we don't win this game. We felt that we had them where we wanted them.
"I don't think anyone can say that we didn't deserve that result. We came here to get on the ball and play and show that we could do something. We've got a group who are pretty inexperienced and we're proud of them all at the moment."