Southampton boss Ralph Hasenhuttl says they must be "perfect" to beat Manchester United.
The Saints have been one of the surprise packages in the Premier League this season and go into the weekend fixtures occupying 5th place in top-flight.
"Simply do a perfect job," said Hasenhuttl when asked about his approach. "It sounds simple, but it's difficult to do it, because they have a strong side and they are on a good run, especially in away games, where they have a good record.
"We know it is tough, we are the underdog, but we go in this game to be as competitive as possible and to be a strong opponent and let's have a look at how many issues we can cause them and how much problems we can make for them and then we can hopefully take something."
