IT’S the knock-knock joke with a cruel punchline that has left Dylan Walker with a suspected broken hand and Manly’s faint finals hopes in tatters.

On Monday the Sea Eagles star was fined $10,000 and issued a breach notice after he injured his hand punching the front door of his northern beaches apartment following a night out with teammates on Saturday.

Walker is expected to miss a month of football in what couldn’t be worse timing for the Sea Eagles.

media_camera Dylan Walker injured his hand punching a door.

Several players were enjoying a few drinks, according to witnesses, on Saturday night following a morale-boosting 36-6 win over St George Illawarra five days earlier.

The Sea Eagled confirmed Walker and his partner, Alexandra Woods Ivkovic, met with club officials on Monday morning.

“They admitted Walker struck out with frustration and stupidity when he had trouble opening the wooden front door to his apartment,” the club said in a statement.

“He and his partner immediately drove to the casualty department of St Vincents Hospital for X-rays and treatment.

“Walker had been out with several teammates in Manly up until around 10pm on Saturday night, with the players having the weekend off as a result of the bye.”

It is understood Walker was due to have further scans on his injured hand. Results will be known on Tuesday.

It is crippling blow to the Sea Eagles, who play New Zealand Warriors on Saturday afternoon in Perth.

Manly advised the NRL Integrity Unit of the incident, but said they would not be making any further comment on the matter.

It hasn’t been the best week for Walker, who was dropped by NSW coach Laurie Daley for Wednesday night’s third State of Origin match at ANZ Stadium after playing in the first two games of the series.

media_camera Walker with former Souths teammate Aaron Gray after their drug overdose.

Late last year, while playing at South Sydney, Walker and then teammate Aaron Gray almost died after accidentally overdosed on prescription drugs. Walker was then released by Souths and signed with Manly.

Speaking after selection for NSW for game one, Walker told The Daily Telegraph he was grateful to have had so many talented teammates — and that all his previous issues were now “behind him.”

“I have been lucky enough to be surrounded by some great players. The likes of Greg Inglis and Sam Burgess at the Rabbitohs. Australia as well with Cameron Smith, Cooper Cronk. I have been blessed to be around such great players and to learn off them. This week will be another learning curve for me. I will do my best. I’m pretty excited, I can’t wait to play,” Walker said.

“That is behind me (the drugs dramas), it has been a big leap forward since then. I am just really enjoying my life at the moment.”