Manchester United boss Louis van Gaal says his side cannot afford not to score against CSKA Moscow in the Champions League.
The two teams are both chasing Group B leaders Wolfsburg with PSV Eindhoven bottom on three points.
And the Dutchman says a win is a must on Tuesday night.
"I cannot see that [a mental problem behind our lack of goals]", van Gaal told reporters.
"When I see their characters, I don't think they have doubts about that quality. It can change in one match - let that be CSKA, because we need a victory.
"I think the right of the fans is always there [to voice their opinion].
"The first time that we were not the better away team was against Arsenal so I think they have seen it very good. They can sing that [attacking chant], but in the next game maybe they shall sing in another way.
"I have to hope we score against Moscow again because then we are talking in a different way."