With new signing Manor Solomon already injured, the club are struggling in that position as the transfer window nears its conclusion.
The 23-year-old will have surgery on a knee problem, and Fulham will likely dip back into the transfer market.
Reports in the English press have linked them with Brazilian veteran Willian.
"We need more. It's clear we need more," Silva said to reporters.
"Unfortunately what has happened with our wingers is not a normal situation. We have to do something to have solutions, because right now we don't have. We will do our best to get the squad complete.
"We are talking about many games that we cannot just have two wingers to play.
"We cannot, at this level, not have solutions on the bench for that position."