Australia captain Michael Clarke has admitted the batting line up for the Test series against India is still up in the air, and that he doesn't yet know where, or even if, Shane Watson will bat.

Watson recently gave up his all-rounder status, dropping the bowling, so he could stay fit, after a series of injuries. This means the batting line-up now needs a new all-rounder, while Watson is no longer certain of a place.

Clarke was hesitant to give specifics about the top order, given Ed Cowan and David Warner's recent flourishing as an opening partnership. Watson has made it clear he would like to open, though he says he is content in the middle order.

The captain said on Tuesday: "Ed, like Davey Warner, had a really good summer and put their hand up against the No.1 Test team in the world (South Africa).

"Obviously, Shane needs to come back into the line-up somewhere. It's a lot different now that Watto is not bowling. As an all rounder, I think he walks into any team.

"As a batsman, there is a much bigger pool of players, so we need to work out what our best batting line-up is."

The skipper further added that he would likely be ready for the first Test against India on 22 February, having never missed a Test through injury. He missed the last ODI against the West Indies with a hamstring niggle.

Clarke added: "I think I've been lucky throughout my career to be honest, with the degeneration I have in my back. To have played 89 Test matches and to not have missed one is something I'm very proud of."