who should be choosen in place of harbajan?

Since harbhajan is an off spinner, if we have to replace him due to his poor form i think it should be ramesh powar. Since powar is also an off spinner who is in good form and who is bowling intelligently these days by giving flight to the ball as he wants deceive the batsman in flight and get his wicket. He is looking for wickets which is good thing as that is best way to contain runs too. Piyush chawla is a very promising leg spinner and should be groomed as one.