Manchester United boss Sir Alex Ferguson wants his side to be more clinical in their Champions League decider against Benfica on Wednesday.
Manchester United manager Sir Alex Ferguson insists his side must be "cut throat" if they are to have any success in the Champions League this season.
United faltered in their games against FC Copenhagen and Celtic and still need a point from their final Group F match at Old Trafford to go through.
Ferguson's side had to bounce back from a goal down to beat Benfica 3-1 to seal top spot in Group F and the Scot said: "We seem to torture our fans and staff.
He told the club website: "It won't be an easy game but as long as we remember to finish teams off we will be OK.
"We started slowly and only when they scored did we start to play.
"That's going to be an issue, when we get chances we've got to take them."
"We've too many young players to play with patience. When they play the cut-throat way, they're a good team."
Ferguson added: "This is a game you can't trifle with. It's too important for us. If we get chances we have to take them, but I think we've got a chance."
Nemanja Vidic started the United comeback, before Ryan Giggs and Louis Saha headers wrapped up the victory, and Ferguson admitted it took a change in tempo for the hosts to assert themselves in the game.
Last season, Benfica eliminated Liverpool before losing to eventual winners Barcelona in the quarter-finals.
One of the British teams can win it, and hopefully it's us. Sir Alex Ferguson
United failled to qualify for the knockout stages last season and finished bottom of the group after losing to the Portuguese champions.
"When Benfica scored, that was what lifted us," he said. "As the game went on, we got better and better.
We believe victory is possible and trust we will also have a bit of luck Benfica coach Fernando Santos
"We got good penetration, put Wayne Rooney back up front in his normal position, and that made a difference.
Defender Rio Ferdinand is confident United can raise their game for the decisive tie at Old Trafford but echoed his manager's warning over the forwards' finishing.
"At the end of the day we've won the match and done it the right way."
He said: "The big games - when people are asking questions about us or think we won't do well - we seem to come through it. This is an opportunity to do that again.
And Ferguson hopes his side can now go on to challenge for the trophy, saying: "There's lot of quality in the last 16.
"In the Champions League, you must kill games off when you are on top - because the other teams always have that quality and ability to put the ball in the back of the net."
"We appreciate being there, we can look forward to it at the end of February."
