Viduka did not score and was eventually substituted, but Sam suggests he was a little "too honest" for his own good.
We all know how Cristiano Ronaldo ´works´the referee. Although it has to be said, it backfired on the Man Utd star at Fratton Park last week.
Allardyce: "Mark Viduka was very, very honest. When we talk about referees looking for simulation, Mark Viduka got the reverse of that because he wouldn't go and buy a free-kick.
"He got no protection from Howard Webb, who waved play on. That allowed their centre- halves to hit him harder and harder every time he tried to control the ball.
"From that point of view he had a very difficult game.
"The referee didn't spot what the centre-halves were doing to him because he stayed on his feet.
"In the end, he was his own worst enemy. Perhaps Howard should have another look at it and learn from that.
"We don't want players to dive - that's what everybody's saying - but if you don't give them the free kicks when they stay on their feet, then you're going to have to ask them to go down more."