Indian cricket icon Sachin Tendulkar admitted today that he is contemplating retirement and said, he would reassess his future next month. In an interview to be broadcast on Indian television today, the 39-year-old said he would decide on a series by series basis as he acknowledged that the clock was running down on his record breaking career. The star batsman said, I am 39 plus and it is not abnormal for me to think of it. At that moment, I will go by what my heart says. At this moment, my heart says, I am okay but you will have to look at it series by series.Any talk of dropping Tendulkar, the highest run-scorer in Tests and the first player to score 100 international centuries – had been taboo in India. But some commentators said last month it was time for him to hang up his bat after he made a series of low scores against New Zealand in a home Test series. Tendulkar has scored a record 51 Test centuries but he has now gone 25 innings without a hundred in the five-day format since making 146 against South Africa in Cape Town in January, 2011.Questioned about suggestions from a number of former players that his reflexes had slowed, Tendulkar insisted that only he could determine whether he was still up to playing at the highest level.