KENNY Jackett believes Millwall's punishing fixture pile up took its toll on his players during their 3-0 defeat to Huddersfield Town on Saturday.
Jackett said the Lions lacked "energy and sparkle" as they were resoundingly beaten by the Terriers, who had a greater sense of urgency about them at the John Smith's Stadium.
But Jackett was critical of his side's defending and felt individual errors were as costly as they were uncharacteristic on a disappointing afternoon in Yorkshire.
"Our defending wasn't as good as it has been of late," he said. "We gave poor goals away and they are key moments. We looked like we had played a lot of games.
"I didn't think we adapted well enough to the conditions – we got caught on the ball too many times when it was bobbling up and windy. Quite a lot of our play needed to be one-touch.
"We didn't have the energy to get back into the game – at 1-0 and 2-0 down we still had a chance but at 3-0 we were playing for our pride really.
"I felt we lacked sparkle and energy – but I wouldn't say we had a bad attitude, it wasn't like that."
Jermaine Beckford twice got the better of Danny Shittu to score either side of half-time, while Jackett attributed James Vaughan's strike to miscommunication in his back four.
"Looking at the second one, Mark Beevers and Karleigh Obsorne got themselves tangled up – Mark over-covered and got his angles slightly wrong," he said.
"The third one is just a long ball down the pitch and he's away – generally Danny doesn't get caught out then or like he did for the first goal."
Jackett sent his team out in a 4-5-1 formation with Shaun Batt playing as a lone striker and admitted he considered changing his tactics while the score was still goalless.
He added: "I looked at the formation early on and wondered whether we should have gone two up top – but when we went 1-0 down and we did go two up front, we ended up losing 3-0.
"I will review that when I look at the DVD. Batt was probably unfortunate not to have a go in a two-man attack and perhaps the system made him lack support."