David Moyes feels Manchester United conceded 'terrible goals' on his return to Everton and says missing out on the top four hurts.
United dominated possession for long periods at Goodison Park on Sunday, but saw costly errors condemn them to a 2-0 defeat - meaning they have lost home and away to Everton for the first time in 44 years.
Moyes - in his first game back on the blue half of Merseyside since bringing an 11-year tenure to a close - admits his current employers did themselves few favours as they fell two goals behind by the interval.
Phil Jones' handling of a Romelu Lukaku shot allowed Leighton Baines to open the scoring from the penalty spot, before Alexander Buttner played Kevin Mirallas onside and the Belgian crashed home a second from a tight angle.
Moyes told Sky Sports on another disappointing day for United: "We gave away two terrible goals.
"Prior to that we passed the ball really well, kept the ball, had great control of the game. What we couldn't do was make enough chances.
"We had a great control and we got done by two stupid decisions - a stupid decision to dive in front of the ball for one of them - two poor goals to give away.
"I thought we played very well in the first half. We came in 2-0 down but had been passing the ball really well.
"But we didn't have a final through-pass at times, we didn't have a final finish when they came - there weren't very many of them. That was the disappointing part, that we couldn't do that bit in the final third."
It is now mathematically impossible for United - who crashed out of the UEFA Champions League at the quarter-final stage to Bayern Munich this season - to return to European football's top table in 2014/15.
Asked if that deals a painful blow to all of those connected with the Old Trafford outfit, Moyes said: "It does because it's part of this club to be in it.
"We'll do everything we can to get ourselves back in it as quickly as we can."
A summer rebuilding project has been mooted for some time and Moyes claims the groundwork is already being put in place to ensure that United fare considerably better in his second season at the helm than they have in his first.
He added: "We've already done that and we're doing that behind the scenes just now.
"We'll try and do everything we possibly can to get a team which is capable of winning better than we have done recently."