Celtic manager Neil Lennon admits the Europa League exit at the hands of Utrecht was just as bad as their infamous shock defeat to Ross County in the Active Nation Scottish Cup last season.
The Hoops had boasted a 2-0 advantage from last week's first leg at Parkhead and appeared to be in the driving seat for a place in the group stages ahead of the clash in Holland.
But a Ricky van Wolfswinkel hat-trick - which included two penalties - and a goal from Barry Maguire saw Utrecht progress in style with a 4-0 win on the night to leave Lennon reeling.
"It feels as bad as Ross County, yeah," he said. "We had a decent advantage and we only needed to score one goal. But it's the overall performance, we were second best in just about every area really.
"The first penalty was soft and for the second we shot ourselves in the foot. We've gone one down and just need to weather it and we get one goal and win the game. But we never gave ourselves a chance.
"Refereeing decisions? I'm not going to go on about the referee because that would take away from a poor display. I would just be making an excuse, but two penalties is really poor from us."