FC Lusitans general secretary Diogo Fosta expects a mauling from Europa League opponents West Ham United.
Lusitans are competing at this stage of the Europa League for the fifth time, but are yet to win a game.
"We can't compare the teams," Fosta told BBC London 94.9. "We are very anxious to play in the Upton Park stadium. It is going to be a unique experience. We are very happy.
"Just for the experience of a Premier League team, it is a great challenge for us. We can grow more with this experience and these opportunities."