The pair are working off eachother this season.
Martinez said: "Romelu can inspire people in the squad and because Ross is such a hungry boy he's taken advantage of that influence.
"They are both young men with incredible appetites for the game. Scoring 17 goals in this league (for West Brom last term) is not an easy feat and when Romelu walked through the door he lifted everyone and he started working in the way he did it made him even more well respected.
"If you look at the goals he's scored and chances he's created so far it shows how his decision making is good. His link-up play is as good as his final touch in the box."
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