Sydney coach Paul Roos says the AFL doesn't want to detract from the spectacle of the game by limiting interchanges and should look at increasing the amount of bench players or introducing substitutions.

The issue was thrown into the spotlight on Sunday when an injury-hit Adelaide finished their game against Melbourne with no players on the bench after suffering a raft of injuries.

"I think the AFL is talking less interchange, but I think you need more guys on the bench," Roos said.

"The biggest thing is you don't want to detract from the spectacle of the game.

"Because the interchanges are high the quality of football is exceptional at the moment.

"You can see the high paced games and the pressure teams are putting on, you don't want to take that away by limited interchange.

"The way to do that is hopefully maybe look at some sort of substitution, so you don't have games decided by teams that have got injured players on the bench in the last quarter."

Roos, who is in his final season as Sydney coach, saw the funny side of the kerfuffle over West Coast using mobile phones in the three quartertime break of their clash with North Melbourne at Etihad Stadium on Saturday.

"It's given me a new idea for next year, because I was going to actually stop coaching, but now they've brought the mobile phones out I'm thinking maybe `Waikiki ... mobile phone ... out in the front of the outrigger'," Roos joked.

"I might be a specialist coach or something. It certainly opened up my job description application.

"I'd be dirty if the AFL actually fined West Coast, it would make it a bit limited on me, but it would be a great gig just sitting on the beach watching television and making a couple of phone calls during the game. I'm all for it."

Roos admitted he was pleasantly surprised by the way his new-look side was playing, with successive victories over Adelaide and Richmond giving them a 2-1 start.

The Swans got off to sizzling starts against Adelaide and Richmond and Roos believed getting out of the blocks quickly was even more significant this year.

"There's a lot of off-season changes and I think that's probably contributing this year to needing to get off to really good starts," Roos said.

He also highlighted the excellent early season form of running defender Nick Malceski.

Sydney plays North Melbourne at Etihad Stadium on Saturday and Roos said he expected the Kangaroos would come into the game with some confidence following their win over West Coast.

Roos said forward Jarred Moore was their only injury doubt, but his ankle problem wasn't expected to prevent him playing.

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