Southampton captain Kelvin Davis believes Matt Paterson will learn from the red card shame that cost them any chance of an FA Cup upset against Manchester United.
The Saints were already a goal down to Danny Welbeck's 19th minute opener before Paterson was red-carded by referee Mike Riley for a lunge on United defender Nemanja Vidic.
Southampton head coach Jan Poortvliet was upset by Riley's decision to dismiss the 19-year-old but Davis, who kept the scoreline down with a string of superb saves, said: "When you go down to 10 men against Manchester United then you know it is going to be very tough."
He added: "He is a young lad and hopefully he will learn from it. He went for a ball that maybe wasn't there to be won but he is an honest lad and certainly would not have meant to hurt anyone."
United boss Ferguson said Riley could have helped the situation by speaking to Paterson in the opening minutes when the Southampton player made a number of heavy challenges that went unpunished.
"It was certainly rash and maybe it was easy for the referee to send him off," said Ferguson.
"I think maybe if the referee had booked him in the first minutes then maybe it would have calmed him down a bit, because it was exuberance more than anything.
"He was charging about, and it happens sometimes, he was over-enthusiastic really. Maybe we could have done better but 3-0 is a good result against a good side."
But unhappy Poortvliet was upset with Riley's decisions all afternoon.
He claimed United's first goal was offside, that Paterson should not have walked and United's second-half penalty, awarded for handball, was a "cheap" decision.
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