Reading FC manager Veljko Paunovic gave his verdict after Reading collapsed to a 4-0 defeat against Huddersfield on Saturday afternoon.
The hosts went into the break 1-0 up after a tight first-half, but blew the Royals away with three more goals in the second-half.
The Royals have now conceded more goals than any of the other 91 teams in the EFL so far this season and have conceded over 40 shots in the last two games.
Speaking on the defensive record, the manager said: "The team doesn't defend with two centre-backs, every one should defend.
"When the team is incomplete, it impacts everywhere on the pitch.
"There are two reasons why the team is incomplete. One is because of transfers we haven't replaced, and the second are injuries.
"Those are tough to replace. Those players belong to us and unfortunately we have to deal with the injuries.
"When we lose, I'll always look for and analyse team performances and not individua performances.
"We all have to do better."
With the international break next week, it will now be two weeks until Reading play again.
When asked what his team will be working on during that period, the boss said: "The first goal we had urgency in our defending and it was just a bit unlucky.
"But after the break, the performance wasn't good and we all feel responsible for it.
"Over the next couple of weeks, we need to work, fix the errors and acknowledge where we need to improve.
"We'll be off for a couple of days.
"Then we need to lift the spirit, mentality and willingness to do your best, work hard and learn what you need to do if you're in a different position.
"Overall, a review of our performance so far this season must be made."
The boss also confirmed Femi Azeez and Tom McIntyre will be missing for up to two to three months after picking up injuries in the last week.
Paunovic also confirmed that Ovie Ejaria is still suffering from symptoms of Covid-19 and has not yet made a full recovery.
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