"I heard the news and I was shocked," Big B told reporters Friday on the occasion of his 71st birthday.
Batting great Tendulkar Thursday decided to quit from all forms of international cricket after his 200th Test against the West Indies in November.
"Sachin is the heart of cricket. He is a phenomenal athlete. He has not just excelled himself in cricket, but he is also a symbol of great excellence. It's unimaginable to see him retire. Cricket will not be the same without Sachin," said Amitabh.