Alastair Cook has indicated the upcoming Test series against India could be his last as England captain.
But the 31-year-old left-hander said that whatever his future as skipper, he would like to continue his Test career purely as an opening batsman.
Cook is set to break Michael Atherton's record of 54 Tests as England captain when he leads the tourists in the first game of a five-match series against India in Rajkot on Wednesday.
"Deep down I don't know how much longer I am going to carry on," he said in an interview with this month's Cricketer magazine quoted by The Times newspaper.
"It could be two months, it could be a year."