Schalke midfielder Lewis Holtby has warned his side they cannot switch off even for a minute against Arsenal tomorrow night even though he concedes Arsene Wenger's men may not be in the best of form.
Schalke's 2-0 win at the Emirates Stadium last month saw them climb to the top of Group B, a point clear of second-placed Arsenal with three games left to play.
That loss was one of three the Gunners have suffered in their last five competitive matches, while in the other two matches they scraped a late 1-0 home league win over lowly QPR before claiming a 7-5 cup victory over Reading in a clash they were 4-0 down in at one stage.
Despite that, Holtby knows Schalke cannot afford to treat their opponents lightly.
``They have not been great but they are a great team, they know how to play,'' said the Germany international.
``They have a good young team, a quality team and we are prepared.
``We have got to be focused, we have to focus on our game for 90 minutes plus added time.
``We should show them we are at home. We have 55,000 people behind us and it should be a great game.''
Wenger, meanwhile, still has faith in his team and does not believe the recent slump means they are now bad players.
``I believe I have a team of great players and at the moment they have forgotten it a little bit how good they are,'' he said.
``What is most important is that we play again with our enthusiasm, desire to create chances and enjoy our game, more than about do we concede a goal or not. That is the most important thing.''
Looking ahead to tomorrow's clash, the Frenchman added: ``Firstly Schalke is a very good team - you can see that in their league position.
``They are a very tight team but we have learned from that.
``We did not have a lot of chances against them and we have got to switch better from defence to attack.
``Obviously it is disappointing for us when we don't have a lot of chances. Lately maybe we have been a little bit flat.''
Wenger will be without a number of important players, with Aaron Ramsey the latest to join a long Arsenal injury list.
The Wales international sustained a groin injury in Saturday's defeat at Manchester United, while Theo Walcott is a doubt due to illness.
Schalke could be without Kyriakos Papadopoulos due to a head injury that meant he could not head the ball in training yesterday while fellow defender Christoph Metzelder is definitely out with a hamstring injury.
Manager Huub Stevens revealed he plans to shake up his team to keep it fresh, although denied it was as a direct response to their 3-2 defeat at the hands of Hoffenheim on Saturday.