Austria boss Marcel Koller accepts his side cannot afford to lose to Portugal on Saturday after a shock 2-0 defeat to Hungary in their Euro 2016 opener.
Austria were firm favourites to win the Group F clash against Hungary but fell behind to an Adam Szalai strike in the 62nd minute and then saw defender Aleksandar Dragovic sent off soon afterwards.
Zoltan Stieber chipped home a second late on to leave Austria with an uphill battle in Group F as they prepare for their remaining group games against Portugal and Iceland.
"It's going to be a tight group," he said after the game. "The situation is that we've lost 2-0 and now we have to take at least a point against Portugal -- or even better, three."
Koller said he was unsure if "nervousness" had prompted the loss and added: "We tried to play at our best ... It's down to concentration, and we lost the ball too often. We should have been calmer in our build-up play, but we didn't manage that.
"We knew that they were capable of playing good football and linking up well. Today showed that. They defended well and they also have players who can decide a game going forward. They showed that today, so their performance was no surprise."
Bayern Munich star David Alaba came close to opening the scoring shortly after kick off when he struck the post, but afterwards he struggled to make the impact he would have liked.
Koller said: "Alaba has an unbelievable technique and understands the game so well -- that's why we play him in the centre when he plays in defence at Bayern.
"Maybe it's a little problem but today if he had scored at the start then it would have been different and you wouldn't have asked this question."
Alaba himself said he thought Austria had deserved to come away from the game with a positive result.
"I think we were still the better team, even though that might be shocking," Alaba said. "Now we just have to forget this and push on."
Information from The Associated Press was used in this report.