Ra’ess Bangura-Williams scored on his debut as Millwall cruised to a 3-0 FA Cup third-round victory over Dagenham at The Den.

Dagenham, who sit 15th in the Vanarama National League, did little to disrupt their Sky Bet Championship hosts’ rhythm as they gifted Mihailo Ivanovic a bizarre first-half opener before Casper De Norre doubled their tally after the interval.

Bangura-Williams, who signed a long-term deal with his boyhood club last week, came off the bench to put the result beyond doubt as Millwall booked a fourth-round tie at Leeds on the weekend of February 8.

The opening 25 minutes resembled an attack versus defence training drill as Dagenham were penned in their own half, being limited to aimless clearances as opposed to creating spells of possession.

Despite showcasing their superiority in midfield, the hosts were not using the dominant share of the ball to their advantage in the final third.

A series of skied shots and Joe Bryan’s free-kick – which sailed over the crossbar – was all they had to show for themselves as the scores remained level.

But that did not to stay the same for too long when a series of mishaps at the back gifted Millwall’s misfiring attackers with a goal.

A cross from George Honeyman met the head of the unmarked Jake Cooper, who directed the ball across the six-yard box and into the path of Ivanovic.

Once the forward’s lunged attempt was pushed back into danger by goalkeeper Elliot Justham, Ivanovic was pulled down by Jake Hessenthaler before he superbly managed to get his head onto the rebound, with a quick-thinking move inches from the ground, to nod the ball over the line from a couple of yards out.

The clumsy challenge in the box would no doubt have led to a penalty without Ivanovic’s unconventional finish and such defending summed up Dagenham’s half entirely, with a poorly-executed corner and a heavy touch in the box in stoppage-time by Josh Rees being all they had to show for themselves at the break.

In the second half, the one-sided nature of the tie remained the same as a well-worked move after 70 minutes doubled the hosts’ score.

Bryan surged down the left, with his chipped cross towards the back post being finished on the full by De Norre, who showed great movement to go undetected in the area before guiding his effort into the right side netting.

Alex Neil’s men demonstrated the cutting edge which they lacked early on in the match and 20-year-old substitute Bangura-Williams got in on the act with a driven finish across goal to make it 3-0, five minutes from time.