Leipus was earlier scheduled to reach here this morning and was expected to take the fitness test of Ganguly in the afternoon but he would be reaching here only by the evening, a senior Board official said.
The fitness test would now be held tomorrow, he said.
Meanwhile, Ganguly came out for practice with the rest of the Indian players at the Eden Gardens and looked in good shape.
The Indian skipper started with two laps at the ground and followed it up with light exercises.
Ganguly later had a long stint at the nets showing no signs of discomfort.
The Indian skipper, who had opted to play in the four-day Ranji Trophy match for Bengal against Karnataka which ended yesterday had already declared his fitness for Saturday's Platinum Jubilee One-day match against Pakistan.
A final decision about Ganguly playing in the high-voltage match will, however, be taken by Leipus following the fitness test.
Ganguly could not play the last two Test matches in the just concluded four-Test home series against Australia due to a thigh injury.