Fremantle coach Justin Longmuir hasn’t done a lot wrong this year, steering the club towards a first finals appearance since 2016 — unless you ask David Mundy’s son.

Mundy’s family sat in the on the Dockers’ inner sanctum post-match meeting after Saturday night’s western derby win — the veteran’s last.

But as an impassioned Longmuir addressed the playing group, a slip of the tongue had him in trouble with young Finn Mundy.

“It feels a little bit premature ... we’re not f***ing done yet,” the senior coach said.

“Hey,” Finn cried from halfway up the theatre.

Their coach being called out had Dockers players and staff in hysterics, but Longmuir admitted he had been warned.

“Someone in the front row just said ‘you’ve got to watch your language’ and I just let it slip.”

But it wasn’t long before the generally mild-mannered coach let it slip again.

“It’s a f***ing brilliant ...” he continued, before young Mundy cried from the back of the room “hey, don’t say that word ... I will point it out every time.

After a brief attempt at convincing the youngster he had instead said “far out” he told the youngster to “bring your swear jar down here after all”.

In a nice follow-up to the incident, Longmuir apparently offered Finn $2 for the indiscretion, which he then proudly paraded around the change rooms.

Mundy’s family — his wife Sally and three children — all featured as part of the his Optus Stadium farewell, which including a standing ovation at the 16-minute mark of the first quarter, a lap of the ground after the 24-point victory and a guard of honour from Eagles players.

Longmuir’s comments did however offer a brief glimpse into a meeting so rarely made available to the public and is indicative of the club’s attitude towards the final home-and-away game of the season.

The Dockers face Greater Western Sydney in Canberra on Saturday, with a win and a loss for either Sydney or Collingwood set to put them in the top-four.

Only two other teams have ever jumped from as low as sixth on the ladder into the top-four in the final round of the year.

The Dockers have secured a home final in the first, second or third week of the series. It will be the first time they host a final since their move to Optus Stadium.