The Premier League outfit played out a 2-2 draw with Astra Giurgiu in the first leg of the Europa League third qualifying round first-leg tie at home.
The Hammers were 2-0 up at one stage at the Boleyn Ground, but they conceded twice in the second half following the sending-off of James Collins.
Bilic believes that his team should have defended better after going down to 10 men and told West Ham’s official website: “We played good and created chances and were dangerous and lively and nice to watch, but we should defend better as a unit after Ginge went off.”
Becoming a problem?
While one could say that Bilic is being a bit harsh on his players for conceding twice after going a man down, the fact is that West Ham have not looked defensively great in pre-season.
The Hammers may have conceded just three goals in the Europa League qualifiers, but there have been cracks during pre-season friendly matches.
Against Peterborough United, the London outfit shipped in three goals, against Southend United they conceded twice and Colchester United scored one past them without reply.
Of course, one should not be too critical of performances during pre-season matches, but the Hammers need to defend better as a team.