Bilic has brought in Marko Arnautovic, Joe Hart, Javier Hernandez, Pablo Zabaleta and Sead Haksabanovic so far this summer and while he still wants William Carvalho too, any deal will go down to the wire.
Hammers fans are demanding another winger and centre back in the window to strengthen the side following three straight defeats to kick off the Premier League season.
West Ham have let go of more than ten players this summer, while recruiting just half of that but the Hammers boss believes that going back into the market isn’t the answer.
Bilic said: “It’s not about the transfer window.
“OK, we were looking for one more player, but we had done a good job on paper in the transfer window.
“We made a good squad, a squad which looked good enough to have a good season. OK, it’s still early in the season, but it’s not about the transfer window. It wasn’t because of one player – we didn’t look good as a team.”