Why Sehwag and Gautam Ghambhir are out of the test matches against Pakistan?

Spinners Harbhajan Singh and Murali Kartik were recalled to the 14-member Indian Test squad on Wednesday for the first two matches against Pakistan starting in Delhi on November 22.

But Sehwag and Gautam Ghambhir who both were performing good recent days are omitted !

I don't know why!!

Though here is the Current Test team :
Anil Kumble (captain), Mahendra Singh Dhoni (vice-captain/wicket-keeper), Wasim Jaffer, Dinesh Karthik, Sachin Tendulkar, Sourav Ganguly, Rahul Dravid, VVS Laxman, Yuvraj Singh, Zaheer Khan, Sreesanth, Harbhajan Singh, Murali Kartik and Rudra Pratap Singh

Shewag is out of cricket ,His form is very poor in recent international matches, but he may get good chance if he shows his talent in local matches,