Millwall manager Neil Harris stated that he "didn't recognise" his side in the first hour of Saturday afternoon's 2-2 Emirates FA Cup Fourth Round draw with Rochdale at The Den.
Jed Wallace gave The Lions an early lead from the penalty spot, but goals from Ian Henderson and Matt Done turned the game on its head.
Ben Thompson, however, popped up with 90 minutes on the clock to ensure a replay at Spotland on Tuesday 6th February.
"I want to win every game - we're taking this competition really seriously, hence why I played a strong side," said the boss. "I made changes, yes, but I played a side with a huge amount of experience.
"I'm disappointed with the first 60 minutes. Rochdale deservedly got in front of us. They came here and played like the underdog and played it like a Cup-tie, getting about us.
"I didn't recognise that Millwall team in the first hour. But then I changed the shape and changed the personnel in the last half hour and it was much better. If we'd have scored five or 10 minutes earlier than we did, we would have gone on to win the game.
"However, on reflection, a draw is probably about right and we both deserve to still be in the competition."
The introduction of Steve Morison on the hour-mark allowed Harris to change the shape of the team and gave Millwall more of an attacking impetus.
"We decided to go with three centre-forwards against three centre-halves when we brought on Steve Morison and put them under a little more pressure. That does leave you open at the other end, but we created chance after chance. However, our creativity and end product was poor.
"We were so good at Leeds last week, but so poor today. Sometimes you have to take your medicine, take it on the chin, say well done to the opponent and live to fight another day."