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Ady Pennock blasted his team after another defensive shocker on Saturday.
The Gills head coach saw his side ship four goals for the second time in a week, leaving them with the worst defensive record in the division.
A 4-1 loss at Rochdale came days after a 4-0 home defeat to Bolton.
He said: “We are giving teams goals. The goals we concede are very poor and the under-12 team could defend better.
“We are giving them a leg-up.”
Match Report: Rochdale 4 Gillingham 1
The Gills conceded after 10 minutes on Saturday, following a trend of conceding early in recent weeks.
Josh Parker levelled the scores but Rochdale went on to win comfortably.
Pennock said: “Again, it’s an early goal, we responded well and could have scored again to go 2-1 up but to concede the second is just not good enough.
“I’m very disappointed and we had a few words in the changing room afterwards. It’s unbelievably disappointing with the performance.”
The Gills boss switched from a 3-5-2 formation to a 4-4-2 early on, as his team were under the cosh from the off.
“People weren’t doing their jobs,” he said.
“You ask people to do what they have been doing in training but if they don’t to their jobs in the first five minutes you get ripped to pieces.
"You have to change, or we would be letting in three, four, five, six or seven goals. We had to do it.”
Gillingham ended the game with 10 men and Pennock said he had “no arguments at all,” over the two yellow cards dished out to Zesh Rehman in the space of nine minutes.