Crows can hit the heights but defence needs fixing Adelaide Crows coach Brenton Sanderson says his main concern right now is defence. ADELAIDE'S attacking stocks were emptied out on the weekend when Taylor Walker's knee blew out but it has been the Crows' defence that has taken up most of the time this week. Coach Brenton Sanderson remains confident the Crows can kick a winning score, it is how many goals they are leaking that is on top of his list of concerns. "I still don't feel attack is an issue for us," Sanderson said. I still feel we can score quite freely. The main issue we've been talking about his week has been our defence. We've been leaking too many goals. We've been giving up too many inside-50s. I don't want to give up big scores - I don't want to make it a shootout, if you like. At the top of Sanderson's priorities is finding a way for the Crows to rediscover how to win the contested ball, something they were masters at last season but were smashed at by Carlton. But there is still the issue of replacing Walker. Sanderson will not necessarily look at a like-for-like replacement for the key forward but explore ways to tweak the forward line with variations to the theme of two talls and four smalls. "It's a big setback for us, without question, and it's a new challenge that the football club is going to have to face," Sanderson said. Some players are going to get an opportunity that hasn't been there for them yet. I'm actually looking forward to seeing how our team responds to this new challenge in front of us. It's something we're looking forward to. We'd prefer to have the big fella there, of course, but it's certainly a challenge that we're not going to shy away from. There are some options there - obviously (Shaun) McKernan, Lewis Johnston, (Jason) Porplyzia is not in the side, (Ian) Callinan. It doesn't have to be tall for tall - it can be tall for small. I've said right from the start of the season that when we lost Kurt (Tippett), that we were going to have to throw different looks at the opposition. So we've done that a few times this year, with varying success.