The concept of day-night Tests has Australia vice-captain Michael Clarke a little concerned as he feels it would be difficult to bat under floodlights in the longer version of the game.

Clarke is also wary about the type of balls that could be used for day-night Tests and said he would like to see how everything pans out eventually.

Cricket Australia will be trialling pink and white balls in the state second-XI matches next week to test if they can retain their colour for a minimum of 80 overs as is required in Test cricket.

"I would like to see the ball first, and where are we going to play the day-night Test matches?" Clarke was quoted as saying in The Australian.

"Batting under lights in one-day cricket is much harder than batting during the day. Conditions will dictate that and they will have to try the day-night games in first-class cricket before Test cricket. I am interested to see how it pans out.

"If it can work it would be great for the game. The public would certainly find it easier for the games played during the week to come out and watch after work," Clarke added. 

However, Clarke is against tampering with the domestic circuit, which he considers to be the strength of Australian cricket.

"The strength of Australian cricket since I've played the game for either New South Wales or Australia has been the first-class system," Clarke said. 

"For me the priority is to make sure we don't touch that or we don't lose anything from that. If things are altered or improved that's fantastic, but the first-class system we have is fantastic and that's why we are so strong in all three forms of the game," he added.