The former Spurs striker, currently playing in MLS with Toronto FC, has confirmed that Roy Hodgson's staff have spoken with him about a possible World Cup spot this summer
Defoe made the switch from the Premier League to Major League Soccer at the end of February and has hit the ground running for the Canadian side, scoring three goals in four MLS games.
The 31-year-old has missed games in recent weeks due to a hamstring problem, however.
Defoe has the likes of Wayne Rooney, Daniel Sturridge, Danny Welbeck and Rickie Lambert, among others, to contend with for a place on the plane to Brazil but believes he has not escaped Hodgson's attention despite moving abroad.
"They're watching," Defoe told reporters on Friday. "I spoke to the physio this morning, he called me up and said 'How are you feeling, is everything 100 per cent?' I said 'Yeah.'
"And he said, 'Good, because Roy Hodgson wants the physios to phone all the players that potentially could be in the 23-man squad. He's got a list of 30.'"