A late Aiden O’Brien goal earned Millwall their second Sky Bet Championship victory of the season and ended Leeds United’s unbeaten start to the campaign.

It looked for large spells that the Lions were not going to get the goal their performance deserved, but the ball broke to O’Brien on 73 minutes and he swept home.

The win was their fourth straight over Leeds at the Den and moves them up to 16th in the Championship.

Millwall were on the front foot from the off and thought they had taken the lead on seven minutes, but Steve Morison was flagged offside when he converted at the far post.

Neil Harris’s side continued to dominate, with Jed Wallace causing the Leeds defence constant problem with his pace and trickery on the right. He sent over a teasing cross that was just too far for Fred Onyedinma.

Onyedinma’s pace and power was always causing issues for the visitors, winning a free-kick that Shaun Williams flashed just wide of the left-hand post.

Williams tried his luck again just before the break, but Wiedwald was there to tip his effort over the bar.

The half-time whistle did not stop Millwall in their tracks as they began the second-half how they ended the first.

Firstly, Shaun Hutchinson was denied by Wiedwald and then he was there again to stop Wallace’s deflected cross was sneaking in at the near post.

The onslaught continued as Wallace struck a post from the edge of the area, with Wiedwald beaten.

The chances continued to come for Millwall as Wallace’s cross found Morison, but the former Leeds striker was denied by Wiedwald from close-range.

Just when the home fans began to become frustrated with the number of missed chances they took the lead. Onyedinma found O’Brien and he made no mistake to slot past Wiedwald.

George Saville could have put a more handsome look to the score line, but he blazed over when the goal was gaping.

Leeds were reduced to ten men late on, as Pontus Jansson was unable to continue through injury and despite some late pressure, Millwall held on for their best win of the season.