Port Adelaide's Ken Hinkley works out 'rule of the week' on Friday night Coach Ken Hinkley during Port Adelaide training at AAMI Stadium on Thursday. PORT Adelaide mentor Ken Hinkley is as confused as any AFL coach on umpiring, but he knows the best hint on the league's "rule of the week" is to watch Friday night football. "The umpiring department and the AFL will always tell you there is no theme of the week - and that's why it is important to watch games," said Hinkley. As coaches and players we have to be all over games because sometimes you can pick up little trends. AFL clubs and coaches last week were confused on the holding-the-ball rule. The umpiring department's theme of the week appeared to punish the tackler with in-the-back calls and grant the ball-holder extraordinary time to make a disposal. There was no notice to any AFL club that the umpiring department would focus on this theme. Asked if he was confused last week on the holding-the-ball interpretation, Hinkley said: "Honest answer is yes, because there were times when you looked at decisions and were not sure what was being called. That's when you know you're confused. After being in footy for a long time, I should be able to say I know what is going to be paid there. I can't always do that. The lack of consistency in AFL umpiring prompted Adelaide coach Brenton Sanderson at the weekend to say he was confused and increasingly frustrated. Hinkley added: "You'd like consistency. But umpires do have a tough job. They have to pay decisions they see on the spur of the moment. At times they might get it right, they might get it wrong. The Power has game No. 7 on this weekend's AFL roster, giving Hinkley, his coaching staff and players significant time to pick up the AFL rule of the week. Port will host fellow finals contender Brisbane in the Sunday lunch-time game at AAMI Stadium. Hinkley yesterday re-iterated he has no concern for his players' discipline, despite the tribunal forcing the Power to be without a key player for the third week in a row. Young defender Tom Jonas on Sunday will start his three-game ban for bumping St Kilda defender Dylan Roberton. This follows one-game suspensions on key forward Justin Westhoff and midfielder Kane Cornes for striking and rough conduct respectfully. "The Westhoff one was the disappointing one," said Hinkley. But (as for a lack of discipline) it's just the opposite for us. We don't want to have people suspended, make no bones ... but it's a contact game and there's going to be occasions where you can't control some of it. You've got to promote your players play hard footy. Hinkley was publicly critical of Westhoff, but not of Cornes nor Jonas. He appeared to condone Jonas' aggressive approach to his defending, despite the risk he faces by playing so close to the edge. "Everyone knows the rules and you know the risk involved with the bump," Hinkley said. As a coach you've got to be able to say 'Well, he's playing an aggressive style of football that you want him to play' - at times if you do go a little bit close to the edge, it's (suspension) probably going to happen.