Spurs were expected to bring in a goalscorer at the start of 2016, but Mauricio Pochettino resisted the urge.
As a result, Tottenham have been heavily reliant on Harry Kane for the entirety of the season, and the 22-year-old has not disappointed.
Kane has notched 25 Premier League goals this term, but there have been games where Spurs could have done with having a second striker on the bench.
And Wright believes that Defoe could have filled that void at White Hart Lane perfectly.
"Someone like Spurs, for instance, in January [could have moved for Defoe]. If Spurs had someone like him on the bench… you just don’t know," Wright said. "Only Kane and Mahrez have scored more goals away from home."
Defoe has scored 14 goals for Sunderland this season, with his goals being a major reason why Sam Allardyce’s side still have a chance of survival.
Only six players have scored more goals than Defoe this season, with the 33-year-old rolling back the years.
Defoe has quickly become a fans’ favourite at the Stadium of Light, but Wright has warned that he is likely to leave if Sunderland are relegated this term.
"With Jermain, if they do go down someone will take him away," the former Arsenal striker added. "Someone will take him and have him in and around their bench, because of what he is capable of doing."