Fulham boss Marco Silva says any new striker signing must be capable of an instant impact.

The Cottagers are seeking a replacement for Aleksandar Mitrovic after his sale to Al-Hilal.

Silva said, "If we are going to sign a striker, it has to be someone who can have an impact in our squad.

"Of course we need to sign players, but we need to sign the right ones."

Ahead of Saturday's trip to Arsenal, Silva added: "We have a slight doubt on Willian. João (Palhinha) did all the week with his teammates."