Jorge Jesus has warned his Benfica players not to lose focus, despite holding a 1-0 lead in their Europa League quarter-final with AZ.
Eduardo Salvio's goal early in the second half of the first leg gave them a crucial away win, but AZ are unbeaten in their last six away games in Europe and Jesus knows that reaching the last-four for a second successive season is not going to be easy.
"I'm sure AZ Alkmaar believe they may progress (from) this round," said the 59-year-old.
"Our players aren't thinking of the semi-finals yet.
"The victory in the first leg doesn't leave us much room for mistakes and we have to be at our best (on Thursday)."
Benfica have not lost at home to a Dutch side since 1975 when PSV recorded a 2-1 win in the now defunct Cup Winners' Cup.