New Zealand hammered India by six wickets at the Oval with only Ravindra Jadeja and Hardik Pandya crossing 20 in India's tally of 179.
"I will not judge the team after each and every game. It's a tournament and things like these will happen," Tendulkar was quoted as saying by the Press Trust of India news agency.
"The main tournament has not even started yet. I think, we need to settle down, one or two games may go here and there.
"India should make the most of the practice matches," added Tendulkar, the highest scorer in Test and one-day cricket.
"They should understand what kind of surfaces they might get. I won't panic at all as of now."
Tendulkar also said teams used warm-up games to try different combinations, which was another reason not to delve too much into the results.
"Teams are trying different combinations," he said. "Almost all teams are not sure about their front-line playing 11. Several bowlers and batsmen are rested," he said.
"All the teams are preparing and trying different combinations in those conditions which would work for them," said the former opener, who played in six World Cups.