Wales striker Robert Earnshaw believes defeat against San Marino in Wednesday's Euro 2008 qualifier is "unthinkable".
Wales go into the game on the back of Saturday's disappointing 3-1 defeat to Cyprus which left John Toshack questioning his own future.
San Marino have lost every one of their 43 matches and Earnshaw says it is vital they put the minnows to the sword to try and erase the memory of the performance against Cyprus.
Unthinkable"It's unthinkable that we cannot win against San Marino - a draw or loss would be a disaster for us," admitted Earnshaw.
"The Cyprus defeat was a massive disappointment for us all and a rubbish result. Now we need to beat San Marino - it has become a 'must win'.
"We must beat them and we know the pressure has increased on us now. There are no ifs or buts about it - there is no other result than a win for us now."
Earnshaw added: "We let ourselves down in Cyprus.
"We must put that right here. After that defeat, we all said our piece and now we need to get on with it and show we are better than that.
"We gave Cyprus cheap goals and we should be better then we are. The mistakes should have been limited - it was too easy for them.
"If we do the same thing then San Marino will punish us in the same fashion.
"It's not going to be easy, and we all need to step up our game three to four notches. There is no other way of thinking - we must win."