Kolkata:Little master Sachin Tendulkar has a stiff back, but there was no uncertainty over his trip to Pakistan, as the problem was very minor. "Sachin (Tendulkar) has a stiff back. And so he was asked to take it easy. And he did not come out to field in the later half of Monday," Indian team physiotherapist Andrew Leipus said in Kolkata. Leipus, however, said that the batting genius was an absolute certainty for the coming tour to Pakistan. "The problem is indeed very minor. These things are part and parcel of cricket." Tendulkar has been undergoing physiotherapy under the guidance of the physio and has been advised to take rays as also follow some exercise routines.