Tweaks to the ruck rules for season 2019 may mean the big bloke is back in vogue.

Already, some clubs are experimenting with two specialist ruckmen in practice matches with success. Is it possible that we've seen the last of the undersized mid competing at throw-ins?

So how is your club placed in the ruck department? Who is your main, who's No.2, do they both play, what happens in an emergency?

AFL Media took a look at Adelaide's ruck stocks. 

The main man

Sam Jacobs is one of the best big men in the competition. A niggling back injury hampered the 30-year-old last year, but he's back to full fitness. His tap work to his midfielders is elite and he is also strong overhead.

Next in line

Reilly O'Brien is ready to make his mark. The 23-year-old's only two AFL games were in 2016 when Jacobs was injured. O'Brien missed most of last season with back and shoulder injuries, but has been a standout during pre-season, finishing in the top three in the club's 2km time trial.

Can they play together? 

The Crows have preferred to play one specialist ruckman, with key forward Josh Jenkins able to give Jacobs a chop-out in the ruck. O'Brien has been working on improving his forward craft.

Break glass in case of emergency

Paul Hunter, 26, is about to start his fourth season on the Crows' rookie list and is yet to play a senior game. Kieran Strachan, 23, was a surprise selection in last year's rookie draft, having only played a handful of VFL games.