Indian bowling 'a work in progress', says bowling coach B Arun

India's young attack is still 'a work in progress' and 'more time' is needed to iron out its deficiencies, Indian bowling coach B Arun said on Tuesday, after Australia piled up 348-2 on the opening day of the fourth test at Sydney.

Openers David Warner and Chris Rogers shared a 200-run opening stand to put Australia in control on day 1 and Arun said his bowlers have to be more 'consistent'.

"It has been a mixed bag," said Arun. "We have to be lot more disciplined than we are at present. There have been occasions where we have been disciplined but I think the consistency is going to be the key.

"There is a lot of work need to be done on that. We are working on that to be more consistent and disciplined. Every kind of wicket you bowl on is different. You got to adjust to the wicket to be able to do that," he added.

Related: David Warner century leads Australian domination on Day 1; score 348/2

Ishant Sharma was rested owing to a left-knee pain and as such the experience factor in the playing eleven was lacking.When asked if this was a factor on a tough day and easy pitch, the coach replied, "We are a young side and we are in the process of rebuilding and learning. We have performed well so far and we have been very competitive in this series.

"If you notice the first two matches, they could have gone the either way. The fact is we are not as consistent as we need to be. That's a fact and we really need to look hard and work on it.

In a surprising move by new skipper Virat Kohli, Cheteshwar Pujara was left out of the playing eleven with both Rohit Sharma and Suresh Raina coming into the side. Shikhar Dhawan was also left out.

"You have got to look at the overall balance of the team before you decide on the combinations. A lot of thought has been given to that before deciding on the side. Pujara has been exceptional for us earlier," Arun said.

"But the composition of the team is a decision taken by the team management. Players who are benched are spoken to, and they would be given sufficient opportunity to make a come-back too," he signed off.