Sydney coach Paul Roos has criticised the AFL draft process, saying players are too young when they're selected and labelling it a "ridiculous" system littered with too much "crystal-balling".

This year's draft takes place in Melbourne tomorrow, with Roos's Swans holding the No.11 and No.26 selections. In total, 75 players will be picked by the AFL's 16 clubs on Saturday.

While Roos has identified a handful of players he hopes to select, he's taken issue with the entire system itself.

Asked if the draft remains an inexact science, despite the huge amounts of data and footage available on prospective talent today, Roos replied "absolutely" before venting his thoughts on the current format.

"My thoughts are that they're too young … and it's too much of a lottery," he said. "But that's what you're faced with and that's the system you've got to work with.

"There's just too much crystal-balling. We've done our own analysis on it but if you look at the players and their average games, from my point of view it's ridiculous. You're going to have an early pick and you're not guaranteed a bloke's going to play more than 30 games. It's just crazy.

"That could be addressed if it was older because you are speculating with a lot of them."

Roos referred to information released by Champion Data that concluded that pick No.10 in the AFL draft averaged just over 30 games for their career.

While Roos didn't say specifically what age the cut-off should be, the 2005 premiership-winning coach believes there are simply too many question marks over players picked in their teens.

"Will he improve his running, will he get taller for the bigger guys - a lot of what the recruiters have to do is picture them in two years' time," he said.

"If it was another year down the track, then there'd be less speculation and you'd be getting a lot better results in terms of the percentages of players playing AFL footy. All I'm saying is it's a very speculative process at the moment."

Roos said the Swans are seeking to add some speed to their rather workmanlike midfield.

Roos expects highly rated tall Matthew Kreuzer and midfielder Trent Cotchin to be the first two picks, but after that he feels it is wide open.

"You rank them and so forth but in a sense you don't really know when you're pick 11," he said. "I think if you're pick one you say, 'We want Kreuzer or Cotchin' and you know you can control the outcome.

"We'll just take the best player available and we're going to be dictated by 10 other clubs."

AAP