Defoe scored the winner for Sunderland against Chelsea at home in the Premier League on Saturday afternoon.
The 33-year-old striker found the net in the 70th minute of the encounter, which ended 3-2 in favour of the Black Cats.
The win means that Sam Allardyce’s side are now out of the relegation zone and have a great chance of escaping the drop to the Championship.
Nevin was following the match, and he was impressed with the performance of Defoe.
"How fitting that Defoe gets the winning goal?” said the former Scotland international on BBC Radio 5 live on Saturday evening (17:00). "He has held this team together.
“For the second half attitude and Sam Allardyce’s changes they deserve the three points today - no argument."
Against Chelsea at the Stadium of Light on Saturday afternoon, Defoe took three shots, had a pass accuracy of 85%, created one chance, put in one cross, and made two blocks.
The former Tottenham Hotspur and West Ham United striker has scored 15 goals and created 19 chances in 32 Premier League appearances this season.