The 34-year-old striker, who has scored 14 of Sunderland’s 24 Premier League goals this season, put pen to paper on a three-and-a-half-year deal when he arrived on Wearside in January 2015 and signed a 12-month extension last summer.
But Defoe, who was courted briefly by his former club West Ham last month, has yet to make any longer-term plans – much to his mum’s consternation.
Jermain Defoe is not planning on retiring yet
Jermain Defoe signed a 12-month extension with Sunderland in the summer
He said: “My mum keeps asking me, ‘How long are you going to play for? When are you going to do your coaching badges?’
"I don’t know. I just take each day as it comes.
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“Even with my friends in football, Les Ferdinand and Ian Wright, I always say to them, ‘Do you miss it?’ They miss not just the training and the games but just being around the lads in the changing room.
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"It’s important to play as long as you can. That’s why I’ve always looked after myself, because I love it.”