Speaking after the announcement of Jermain's new agreement at the club this afternoon, Head Coach Martin was clearly delighted to be working with a prolific striker who he believes will get better and better.
Jermain has bagged 22 goals in all competitions for us this season - 13 in the Premier League - with key fixtures against Villa, Middlesbrough and Blackburn to go.
"This news a big boost for everyone at the club especially with all the speculation and everyone now knows that Jermain is happy here," said Martin.
"We are happy, he is happy and we can all be pleased.
"Jermain is one of the best finishers in England. He can improve a couple of things but he has a very good mental approach to the game.
"He's down to earth and wants to be better and better. That's what I like in players."
Martin Jol sees Jermain Defoe as a striker who 'will always score goals'.