"They are both quality players and their records speak for themselves. The hard part is the Australian team has a problem of plenty particularly in the top four.

"Both of them are top four players. There is (Usman) Khawaja, (Aaron) Finch, Shaun Marsh, and the two and these guys will try to fit into four slots. Then there is Maxwell, Stoinis. It's going to be a tough selection call," Katich told IANS.

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For the defending champions, the primary selection question centers on how to fit in Aaron Finch, Usman Khawaja and Warner into the top three.

There have been talks of the duo receiving hostile treatment from the fans in England during the World Cup besides being greeted with greater scrutiny after a turbulent 12 months.

After the World Cup, Australia will take on England in the Ashes.

"They will welcome back the experience of Smith and Warner," said Katich when asked about the off-field baggage that comes along with the pair.

"The balance with the batting line-up is what they need to get right," the 43-year old reiterated.

Katich, who worked closely with India's World Cup bound wicketkeeper batsman Dinesh Karthik during his time as assistant coach of the Kolkata Knight Riders, also threw his weight behind the 33-year old whose selection raised a few eyebrows.

"There is a lot of talk around that No.4 spot, and he is a guy who likes to spend time in the middle. Once he is set, he is very hard to bowl to at the back end. He has got all the tricks and he does have the timing and power to clear the rope," said Katich who has played 56 Tests and 45 ODis for Australia.

"It's hard to judge a player based on T20 cricket with ODI cricket," he concluded.

Australia take on Afghanistan in their World Cup opener on June 1 while India open their account against South Africa on June 5. The showpiece event starts on May 30.

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