Khan, 26, had originally stated that he would step away from boxing in two years time, although recent defeats to Lamont Peterson and Danny Garcia have forced the Bolton fighter to be open to an extension, which could be up to another twelve months.
“I know a lot of fighters when they retire want to go back in because they have unfinished business. I don’t want to go that way. If I have unfinished business, I wouldn’t retire,” Khan told The Daily Mail.
“I will know when to call it a day. I will let my body make the decision. And when the time is right to retire, I will.”
An impressive win over Carlos Molina has since put Khan back on track for a rematch with WBC and WBA title holder Garcia, although a huge 2015 clash with Floyd Mayweather would be the icing on the cake for his career.
“At 28 or 29 I will call it a day,’ he added. ‘I’m 26 years old now and I think in three years I can have six fights – and they can be six big fights. But I’m in no rush. Mayweather wants to fight for a couple more years.
“In my career, I think we will definitely have a Mayweather fight. I want to fight in April but that won’t be against Garcia because he is fighting in February against Zab Judah.
Khan added: “I have been in the position where it was nearly over. That has motivated me and makes me train harder. I never want to be in that position again.”