Maresca is delighted with the actions he is seeing from the striker.
Reflecting on last week's 4-3 win at Tottenham, Maresca admits Jackson was unhappy with him over his substitution call late in the game.
The manager recalled, "When we scored and made it to 2-2, everyone went to Cole Palmer to cheer. But only one player went to the ball to take it up to the middle. It was Nico.
"It shows he's a winner. Players cheer while one takes the ball up to the middle. It shows what type he is.
"He was angry and disappointed because he didn't score."
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