Manchester United boss Louis van Gaal believes the outcome of the FA Cup quarter-final against Arsenal will not just affect the destiny of the venerable old trophy but also the contest for Champions League positions.
The Gunners travel to Old Trafford on Monday to defend the trophy they won against Hull last season with the two sides neck and neck in the league - Arsene Wenger's side are one point ahead in third spot.
Van Gaal said: "Arsenal and United are now in third and fourth place, so it is a big event with two good teams. I hope we can give a fantastic match for the fans.
"I think if we beat them it is a big blow for them, but if they beat us it is a big blow for us. It is very important game, not only for the FA Cup but also for the [Premier League] rat race."
Van Gaal also paid tribute to the longevity of Gunners boss Arsene Wenger, who has been in charge of Arsenal since 1996.
He added: "In my opinion what he has done is amazing. It can only be in England, I believe, where managers are so long committed with one club.
"It shows how much he can mean for a club as a manager. I like that - like Sir Alex Ferguson, Arsene Wenger - I think it's fantastic that you can do that."
Meanwhile, Marouane Fellaini admits United face a "massive game" against Arsenal if they are to end the season with a trophy.
Ronaldinho dream XI
Ronaldinho dream XI
1/11 GK: Gianluigi Buffon
Ronaldinho says: "There have been some very good goalkeepers in my era, but Buffon is there for consistency. Most of the goalkeepers have had times when their form has not been so good, but Buffon has been at such a high level for so long."
2/11 RB: Marcos Cafu
Ronaldinho says: "You don’t become the most capped player in Brazil’s history, without being very special. I was so happy when he finally won the Champions League with Milan, for the best right back ever not to win the biggest club trophy would not be right."
3/11 CB: John Terry
Ronaldinho says: "We [Barcelona] had some big Champions League games against Chelsea, and I could see then why John Terry is still so important for them now. He is very tough to play against, but he is a fantastic leader, the leader you need in those sorts of games."
4/11 CB: Paolo Maldini
Ronaldinho says: "He was one of the best defenders in Champions League history, but what was so impressive about him is that when he was on the ball he didn’t look like a defender, but like an elegant midfield player."
5/11 LB: Roberto Carlos
Ronaldinho says: "Would be worth having in any team for his ability to take free kicks, but as well as being one of the best free kick takers ever, he is also one of the finest left backs ever. So important to all of Real Madrid’s Champions League wins."
6/11 CM: Claude Makelele
Ronaldinho says: "Defenders feel safe knowing that he is ahead of them, the attackers feel safe knowing he is behind them, for me he is the best I have ever seen doing the job of protecting the defence. You never saw him play a bad game."
7/11 CM: Frank Lampard
Ronaldinho says: "I told Frank Rijkaard that we (Barcelona) should sign him, but he didn’t want to leave Chelsea. I am sure they would not have let him go, at that time he was one of the greats in Europe. His goal record from midfield was what really impressed me."
8/11 CM: Kaka
Ronaldinho says: "Things did not work out for Kaka as well as expected at Madrid, but we must not forget the player at Milan who was the real Kaka. For two, maybe three seasons he was the best player in the world, there was nothing he couldn’t do."
9/11 FW: Lionel Messi
Ronaldinho says: "I have won everything, it is impossible for me to have regrets. I do wish though that I could have played with Messi for longer than I did at Barcelona. There are no words to describe him; he just has magic in his feet."
10/11 FW: Ronaldo
Ronaldinho says: "He was my idol and then I end up playing and winning a World Cup with him. The most complete striker there has ever been, the most complete striker there will ever be, it is almost unbelievable to think that he never won the Champions League."
11/11 FW: Thierry Henry
Ronaldinho says: "My good friend who I played with at Barcelona, and there was even a chance that we nearly played together again in New York. Just a nightmare for defenders, was quick, had skill, and was strong."
The Belgium midfielder, who was on the losing side at a Wembley FA Cup final with Everton, insists however that Louis van Gaal's side can take confidence from their last-gap win over Newcastle in midweek.
He says United need to win at Old Trafford to avoid a tough replay at the Emirates.
Fellaini told MUTV: "It will be a challenge. Monday is a massive game. We have to win it in one game because playing at Arsenal would be difficult. The FA Cup is a special competition, a big trophy in England. I lost a final. I played in a semi-final. This season, I can win it.
"We have showed it spirit already a lot of times now and we have to continue like that. We have a big game on Monday, so it is good for the confidence.
"We always keep going and scored in the last minute [ against Newcastle]. The spirit was good, we kept going and that is important."
Striker Robin van Persie will miss the clash against his old club due to an ankle injury, and defender Jonny Evans will sit out after he was banned by the FA for six matches for spitting at Newcastle's Papiss Cisse.