he informed his decision to retire from one day cricket before the selection meeting of the pakistan series

Source http://www.espncricinfo.com/india/content/current/story/598302.html

"Tendulkar's announcement of his ODI retirement came through a statement from the BCCI which stated that he had spoken to BCCI president N Srinivasan. His retirement was announced on the day the Indian selectors picked the teams to play in the five-match T20 and ODI series against Pakistan.

"It was not sudden. He informed us before the selection about his decision," Sanjay Jagdale, the BCCI secretary, told reporters. "He spoke to me and the president about his decision. Naturally he must have been (emotional) I can't say we just spoke on the phone."

"What he has expressed is his concern that India has to prepare for the next World Cup," the BCCI's chief administrative officer Ratnakar Shetty added. "From that point of view, he felt that it was time that he retired."