Manchester United manager Louis van Gaal says his team should have scored at least three goals against PSV Eindhoven in Wednesday's Champions League game at Old Trafford.
The Red Devils registered yet another goalless draw, their fifth of the season in all competitions.
But the Dutchman insists his team can still make it through to the Last 16 of the competition.
"I think the first half was a reasonable performance," van Gaal said.
"We have created three open chances and three other chances and we give only two chances away against a very defensive opponent. But then the second half was not great and I think it is a miracle that we didn't give chances away in the second half - only one, I believe.
"Still [in the second half] we have created one big chance for Jesse Lingard which we could have finished and that is very disappointing, also for the fans, that we didn't score, though he played very well.
"It was so close but we still didn't score. We could have qualified and it's a big disappointment also for the players.
"It's also a big disappointment for the fans because everybody counts at Manchester United at home that they shall win. But it is not so easy, and that we know, but we never admit that.
"Of course I am worried [with the lack of scored goals] but I know also that goals are not always a consequence of good or bad performances.
"Today we could have scored at least three goals - they were not the most difficult chances, but we didn't score. Yet in the next game, we could score out of nothing. That's football.
"[But] we are still second and are still in the qualifying position. We have to win in Wolfsburg and that's a difficult game, but everything is possible, it is never impossible.
"We won at home against them, so why can't we win away? We can win everywhere. We prove it this year. Also in the Premier League, our average in away matches is much higher than last year. And we have to do that also in the Champions League."