Millwall boss Neil Harris expressed his delight at The Lions' "impressive" play in Saturday's 4-1 Emirates FA Cup Third Round victory over Barnsley at The Den.
Brad Potts gave The Tykes an early lead, but goals from Aiden O'Brien (2), Ben Thompson and Fred Onyedinma eased Harris' men into Round Four.
The manager was pleased with a selection of players that came in and "took their opportunity" in the win.
"I thought we started the game really well and were excellent for 10 minutes," he said. "We should've gone in front, didn't, and then conceded a sucker punch of a goal.
"It took us 10 minutes after that to find our feet again and the 20 minutes before and just after half-time, I thought we were as good as we've been this season. Some of our play was very, very impressive. We passed the ball well and looked a goal threat for long periods.
"We were on top before we went behind, playing some good stuff, forcing some set plays and looking dangerous from corners. After the goal, I wondered what the reaction was going to be. It took us time to get going, but I told the boys to express themselves and that in no uncertain terms we were to win the game and get into the next round. I was really pleased with the reaction.
"I'm delighted for the players that came in and took their opportunity. Tony Craig, Ben Thompson, Fred Onyedinma - they all took their opportunity. I played a very strong side but made a couple of changes, firstly to give some people minutes and secondly to rest a couple of players.
"When you do that, sometimes you lose a little bit of continuity, especially here at The Den, but we didn't show any of that today. We were a quality side.
"We had some good leadership on the pitch today in Tony, Steve Morison and Shaun Williams, Shaun Hutchinson, too. There was a lot of good individual performances."