Dugan has come under fire for his wayward attitude as highlighted by his Origin bender with Blake Ferguson before being scrapped from the Dragons’ must win game against Penrith on Sunday for missing the team bus.

He also reportedly missed the plane back from Brisbane last week after playing the Broncos but has denied this.

Dugan joins the Sharks from 2018 on a $3 million deal and Gallen said Dugan will soon realise the high standards that are expected of him.

“I am, I’m certainly happy we’re signing him,” Gallen said on Sky Radio’s Big Sports Breakfast.

“Without a doubt, he’s a great player and you talk about fitting into a culture and fitting into a club, well he’s just going to have to.

“And I think he’ll learn that when he gets here and sees the way we train in the pre-season, sees the attitude in the team meeting, how everyone buys in and puts into what we’re doing.

“And if you don’t do that, well I’m not going to say he won’t play, but it’s going to be a long few years for him — because you’ve got to come and fit into a team and come in and fit into a culture.

“We’ve turned ours around (in) the past three or four years from things we’ve been through in the past.

“We’ve got a real strong work ethic here now and I think he’ll come in and fit in fine.

“As I said if he doesn’t it’s going to be a real long time for him and that’s just the way it is. He’s going to have to.”