Rangers boss Walter Smith knows his team failed to perform to an acceptable level in the 4-1 loss to Unirea but insists the buck stops with him.
Smith also refused to blame the financial constraints at the club for the level of performance.
"Everybody that's here takes the responsibility for it," said Smith.
"I take the ultimate responsibility for it, so we just have to try and make sure that we don't allow it to derail us in any way."
Smith was not able to buy any players in the summer as the Ibrox club trimmed their wage bill, with loan signing Jerome Rothen the only new face in a small squad.
"Our job is to be successful regardless of what people imagine our circumstances are," added the former Scotland boss.
Over the last few years we've suffered one or two disappointments and everyone has always rallied round and come back again
Walter Smith
"We should have done better. We can't get away from that aspect of it. It was a poor performance from us overall and that's where we stand.
"It was a poor result. It will go down as one of the poorest that I've had but you get them and while you don't like getting them, you have to accept them, albeit grudgingly, and get on with it.
"The disappointment of it comes from and is felt by everyone here from managers all the way down to the players."
Unirea coach Dan Petrescu admitted surprise that Smith had elected to field only one striker on Tuesday and Rangers have been criticised for not adopting a more attacking line-up.
"There's a lot of talk that if you play with two forwards and then you're outnumbered in midfield, you should've played with one," said Smith, who led Rangers to the 2008 Uefa Cup final.
"If you play with one, people say you should've played with two.
"Like every other tactic, you've got to win a game and that's where the reflection comes in anybody's selection.
"If you win, you get it right. If you don't, you get it wrong. That's the way a manager lives and we accept that.
"We've had a steadiness in terms of domestic results. Whether we're at the stage where we can hope to compete with the top European clubs, or even now the ones below that level at the present moment is always down to debate but we managed to do it before.
"I wouldn't have said that there wouldn't have been that much difference between our team two years ago and the one there is now. We put up a better showing at that stage than we did do the other night."
Rangers sit top of the Scottish Premier League going into Saturday's visit of Hibernian and Smith is hoping for a positive reaction from his players.
"Over the last few years we've suffered one or two disappointments and everyone has always rallied round and come back again so hopefully it will be the same this time," added Smith.
"We don't like losing games in the manner that we did the other night there so, I'm sure we will work hard to try and rectify that and I'm sure we'll get a good reaction tomorrow."
Meanwhile, striker Kris Boyd is still hopeful Rangers can recover from their poor start in Champions League.
Tuesday's defeat left the Ibrox side bottom of Group G, with only one point from three games.
"You need to look forward," said Boyd. "There's nothing you can do about it, it's by you.
"You can learn from your mistakes and improve when we go away to Romania in a couple of weeks.
"We knew we had to pick something up on the road anyway so, looking at the table, Sevilla are going to go through. The other three are fighting for the second place."
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