Collingwood's decision to bring debutant Mark Keane into their defence for Sunday's clash against Fremantle has been widely scrutinised.
Buckley's call to omit defender Jarrod Roughead for the first-gamer left Collingwood's backline vulnerable and allowed Fremantle forward Matt Taberner to get off the leash.
Taberner kicked four of Fremantle's the 10 goals in the 12-point win.
Ex-Bomers star Matthew Lloyd was "staggered" with the decision to drop Roughead and said Taberner would not have been able to kick four goals on the veteran.
“Four goals in a tight game, that really hurt them. I was really surprised (by the decision to play Keane). I think it was a poor decision by Nathan Buckley," Lloyd told AFL Media's Access All Areas.
"This one staggered me. Poor Darcy Moore, he was trying to play on two players yesterday (Sunday)."
Keane played 80 minutes of game time, recording seven disposals, one mark and two tackles.
Collingwood dropped to tenth on the ladder after the loss.
The Magpies will look to get back on the winner's list when they face the Sydney Swans at the Gabba on Thursday.