Manchester City midfielder Nigel de Jong accepts their season is on the line this week against Hamburg.
"Of course it is going to be a huge test of our character, and we have a lot of young guys in the squad," said De Jong.
"We have to get our thoughts right and our focus right for the Hamburg game. We have to show what we are made of now, show the right mentality out on the pitch. Everybody has to give everything for the team."