Millwall booked their third appearance in the FA Cup quarter-finals for the second time in three years, after an early Murray Wallace header secured safe passage through to the last eight.

Just before the Lions’ defender’s bullet header after five minutes won the tie, Joe Piggott had hit the post got the hosts, and if it was not for the woodwork, they’d have had the advantage at Kingsmeadow.

Tonight’s draw will involve Millwall for the fourth time in 15 years, and confirm their opponents for a shot at being in a second semi-final in six years.

Having had a break from Championship action, Neil Harris’ side are two points above the relegation zone.

There will be things the Lions boss had seen in the win that he could take into Wednesday evening’s match at Pride Park.

With that said, here are THREE things we clearly learnt about Millwall after their 1-0 win over Wimbledon

Need to be better on the ball

Wimbledon boasted a better possession percentage during the game, and despite the Lions being better without the ball, they were wasteful in possession at times against League One’s worst team on current league positioning.

Too many times the Lions misplaced a pass or chose the wrong option.

They might have got away with that last weekend, but they won’t in the next round or in the league in the coming weeks.

Harris must learn from this and look to improve ball retention and distribution.

Not clinical enough

Murray Wallace’s fifth-minute goal was the difference at the weekend and Millwall should have had more than the one they ended up with.

The Lions had three other chances to add to their lead – good chances – and squandered the lot of them.

Lee Gregory, Aiden O’Brien and Shaun Williams all had guilt-edge chances and might not get those chances when back in league action.

Finding a way to score more of their chances should be a key aspect to his training in the build-up to the derby game.

Alex Pearce deserves some league minutes

Soccer Football - FA Cup Fifth Round - AFC Wimbledon v Millwall - Kingsmeadow, London, Britain - February 16, 2019 Millwall's Alex Pearce celebrates after the match REUTERS/Eddie Keogh

Shaun Hutchinson has been Millwall’s main man at the back with Jake Cooper, but due to a slight knock in the lead up to the game, on-loan Alex Pearce started ahead of him at Kingsmeadow.

Pearce was solid throughout and a vocal, physical presence throughout the whole game.

He, of course, cannot play against his parent club on Wednesday, but he should be given a chance to showcase his skill set in league action after two impressive FA Cup performances this term.