Silva is expected to out of action until October as he recovers from emergency bowel obstruction surgery and was due to be left out the squad until Hernandez was sold earlier this week.
A senior club insider speaking to Claret and Hugh yesterday confirmed the club accepted that they were short of cover in the striker department but the manager had great faith in Albian Ajeti and was sure it would make his impact on the Premier League when required.
The Hammers will wait until January to decide whether to dip into the transfer market to add re-enforcements upfront.