SYDNEY Swans co-captain Kieren Jack has warned his side can't get obsessed with bombing the ball into prize recruit Kurt Tippett, despite their other established key forwards all being injured.

The Swans' three main targets from last season - Sam Reid, Adam Goodes and Lewis Roberts-Thomson - are all sidelined, with none expected to return for more than a month.

Tippett's availability following suspension has been a godsend for the Swans.

He has kicked two goals in each of his first three games and looks likely to shoulder a bigger burden up forward.

"Certainly, if he wasn't playing, our depth would have been tested even more," Jack said.

"But it's nice looking up the ground and seeing a big 203cm target you can kick to.

"We've got to make sure that he's not just the only target down there and we've got some depth in there as well.

"We want to make sure we've got a couple of avenues to goal.

"Our midfielders really push in there and try and kick goals as well, but it might open up an opportunity for someone like Mitch Morton to come in.

"He seems to play that role pretty well even though he's not a key forward size but he knows where the goals are.

"This coming weekend will provide opportunities and it's whoever wants to take them will get the spot."

Jack's younger brother Brandon seized his chance last weekend against Melbourne, kicking four goals in just his third senior game.

Kieren has never kicked more than three in a game and admitted that before the season started, he didn't expect his sibling to play senior footy this year.

"I've been rapt with his development and the way he's improved," Kieren said.

"Since November, his improvement has been exceptional and he's surprised me."

Although Kieren and Brandon played for Pennant Hills in northwestern Sydney, they ended up at the Swans rather than crosstown rivals Greater Western Sydney, who they play at the SCG on Sunday.

"I am borderline - I think I just actually fall into the Swans zone, so that's quite lucky," Kieren said.

"I was a little bit worried when my brother was coming through because he could have fallen into the GWS zone but, luckily, he fell in the Swans."