West Ham have injury problems for the Europa League play-off second leg with Astra Giurgiu.
The clubs drew 1-1 in Romania last Thursday.
Andy Carroll, Andre Ayew, Aaron Cresswell, Sofiane Feghouli are all injured, while Manuel Lanzini and Dimitri Payet have also missed games.
"We are not going to protect the away goal," Bilic said. "It gives you an advantage but you cannot hang on for 90 minutes. We will play a normal game."