Neil Harris praised the attitude and quality of his Millwall team after the League One side knocked Premier League Watford out of the FA Cup to reach the fifth round.
Top scorer Steve Morison netted his 14th goal of the season five minutes from time to win the tie for the hosts.
Millwall had beaten top-tier Bournemouth in the previous round and Harris applauded the all-round performance of his men against Watford, and paid particular credit to match-winner Morison.
"We've had two clean sheets against two really good, established Premier League sides," he told Sky Sports. "They've been in the Premier League for the last couple of years now but they've played here regularly over the last 10-15 years, so, yes, they've made changes to their team but they've come with experienced players.
"Watford paid us total respect today with their selection and I thought we were outstanding. We could have been three or four up by half-time. If we'd been a little bit more lucky in front of goal we'd have been out of sight by half-time.
"But credit to my boys, when they had little spells of pressure in the second half we defended as a unit, we defended with discipline and then when you want moments of quality, the ball in by Shane Ferguson, and the finish by our talisman, Steve Morison, was worthy of winning any cup tie.
"Morison has done really well for me. You can see he plays with his heart, he plays with his passion. He leads the line and he talks to the younger players. And I thought, individually, we were excellent today. The front pair were a real handful all game and the centre halves were excellent, too."
Harris said Millwall - who are chasing promotion in League One - went into the tie with nothing to lose and expects them to take on whoever they face in the next round of the FA Cup with a similar approach.
"I said to the boys, we've got everything to gain today. Were we expected to get through? In our dressing room we were. Everyone else? No not really," said Harris.
"It's about making it difficult for the opposition to play here at the Den, to put an honest performance in first and foremost which the fans can appreciate and then add the quality and today I thought we were excellent.
"Showing no fear sums us up as a club. And I'd like to think us as a club, Lincoln yesterday, and Wycombe to a certain extent, epitomised what the FA Cup was all about.
"I'm not fussed who we get but I'd certainly like to be here at the Den. We'd like to be at home against anybody and I don't think there would be many sides who'd fancy coming here in the fifth round."