Gen Bajwa also said that the region surrounding Pakistan remains captive due to "historical baggage" and "negative competition".
This will be the fifth time that Prime Minister Sharif will pick the top commander of the country's nearly 550,000 ground troops.
In a letter to Pakistan Foreign Minister Shah Mehmood Qureshi, Singh said it is a historic occasion, but regretted his inability to be present.
Senior police officers were among 13 people killed on Monday when a Taliban suicide bomber blew himself up targeting them during a protest rally outside Pakistan's Punjab assembly in Lahore that also wounded 60 others.
India slams the Pakistani prime minister for 'unwarranted reference to J&K' during pious occasion.
The brutal Tehrik-e-Taliban Pakistan assault has claimed 141 lives, including 132 school children, six terrorists and three armymen.