Manager holds hands up after 3-0 Den defeatLions boss Ian Holloway believes there was a 'lack of structure' to his team after watching Nigel Adkins' Reading side come away from The Den with a 3-0 win.
The Royals went into the interval 1-0 up, and with Millwall chasing the game in the second-half, Ollie brought on Jermaine Easter, Lee Martin and John Marquis to find a way back into proceedings, only to concede two further goals in quick succession.
"I've always been a bit of a gambler when it comes to winning a game," he said. "But we lost our structure. That's my fault, and I apologise for that.
"We had spells during the game but I thought we were a bit nervous at times. The first goal was crucial, but Reading got that.
"In the second-half we had to score the next goal, but that went to them too, and in fairness, Nigel (Adkins) has got Reading playing. They had two good banks of four and played off the front men well.
"We have to dust ourselves down and go again against Burnley next week. Let's see if I can get more organisation and make sure we man-mark better."
Shaun Williams and DJ Campbell made their full debuts in Saturday's defeat, and Ollie believes his options have been further strengthened with the additions of Ed Upson and Simeon Jackson over the last 24 hours.
"We've got some good signings in now. They'll help us to play how I want us to play," he said.
"Ed started at Ipswich, went to Yeovil and is my kind of player. He's got fantastic ability and can really pass the ball and score goals.
"We've picked up Simeon on a short-term deal, and he was desperate to come here, play well and score goals for this football club."