Coach Kasper Hjulmand says his side believe they can cause an upset against the Premier League leaders.Photo by Stuart Franklin/Getty ImagesBayer Leverkusen are under no illusion about the size of

Arsenal are the team to beat in Europe at the moment, having won all eight of their league games and thereby topping the table.

William Saliba has missed the last two matches with an ankle injury but took part in first-team training on Tuesday and Arteta confirmed he is fit to start.