When Arsene Wenger proclaimed that his players would give "every drop of blood" at Chelsea this evening, it reflected a determination to end their season-defining week on a high. Seven days ago Arsenal were dreaming of a Treble. They do not want to wake tomorrow with only the championship to occupy their minds.

Though Wenger denied that tonight's FA Cup quarter-final replay had taken on greater significance after his team's disappointing Champions League exit, there seems no question that Arsenal's desire to achieve back-to-back doubles is all the greater now that they cannot earn the title of Europe's best side.

Stamford Bridge will not be easy for them, particularly if Patrick Vieira and Sol Campbell fail fitness tests. Having lost at Valencia and taken on Everton on Sunday, tired legs and minds are guaranteed, but Wenger senses a deep will to succeed.

"We will be up for it and we will give every drop of blood," he said. "How we will respond I don't know, but I know we will give everything."

Despite Thierry Henry's insistence that the players "laugh" at the verbal jousting of Wenger and Alex Ferguson, they are surely driven not only by the chance of glory but a craving to prove wrong those who suggest their season might fall apart.

Games at Chelsea tend to bring the best out of Wenger's side. Arsenal have lost only once in eight visits under the Frenchman, in the League Cup. In September they came from a goal down to draw 1-1 after Vieira was sent off and in 1999 Nwankwo Kanu scored a late hat-trick to turn a two-goal deficit into victory.

Such achievements require mental strength as well as skill, and Arsenal expect to have to call on that quality again. The win over Everton was notable for grit rather than fluency.

Arsenal realise Chelsea's last hope of a trophy rests on the FA Cup, and Claudio Ranieri's team did not play last midweek and have had an extra day to recover from a less demanding weekend match, a 5-0 hammering of Manchester City.

"People talk about winning with style and when you can do it, great," said Henry. "But if we can win all the games like Sunday I will take it. We didn't play well individually but we played well as a team. Everyone was fighting for each other."

The need to dig deep will multiply if Campbell (Achilles) and Vieira (knee) join David Seaman on the injury list. Without Campbell, Wenger would probably have to pair Pascal Cygan and Igors Stepanovs. He will doubtless make changes to freshen things up, with Ray Parlour in contention to start, but Henry, outstanding in the initial tie, hopes to keep his place.

"I have only played one game in the Cup this season and it was against Chelsea at Highbury," he said. "Usually the boss rests me in the Cup but I always want to play. It is a great competition. It would be disappointing to get this far and then go out. We are up for it against Chelsea. Obviously, to win the double again would be a great achievement. To stay strong in the league is the priority but we would like to do both."

Reaching the Champions League is Chelsea's priority but they would love to avenge last season's FA Cup final defeat by Arsenal and lift the trophy.