The aim is for Defoe to keep his fitness levels up with the MLS season now over so he's raring to go when the season gets underway again in March.
We can confirm that @IAmJermainDefoe will train with our Development Squad for the next week to maintain fitness during MLS close season.— Tottenham Hotspur (@SpursOfficial) January 8, 2015
The former England international has been linked with a move back to Spurs in the January window given the club are on the lookout for a striker but that doesn't appear to be the case, while there have been rumours that the 32-year-old is currently unhappy in the MLS.
He has been linked with several clubs in the Premier League including Queens Park Rangers, Liverpool and Leicester City.
QPR have been the strongest linked with the striker, with Defoe having worked under manager Harry Redknapp at West Ham United, Tottenham and Portsmouth during his career.
But any move to Spurs looks unlikely and it's just an arrangement purely for the player's fitness going forward, with many players who have previously played in the Premier League. The classic example would be Thierry Henry with Arsenal while he was playing for the New York Red Bulls - but that ended up in a short-term loan deal at one point.
However, one would think that Spurs are after a more permanent solution up front. Harry Kane has been in fine form for club this season, but Roberto Soldado and Emmanuel Adebayor haven't produced as much as Mauricio Pochettino would have liked.