Silva has made it clear he wants another four players to arrive before Thursday's deadline.
"We have to be busy," said Silva, whose side have scored only three goals in seven pre-season games. "In this moment, as you know, our number is not really big. We need some more players.
"We have to look for one central defender. Let's see in the middle zone if we do something more or not. Then a possible striker and right back. It has to be a really busy week.
"Of course, it is not the best things but our board and our football structure, they are trying to do their best to give us the conditions to be more competitive and be a better team."
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