Martinelli has battled to break back into the first team since returning to full fitness, but on-loan Real Madrid star Odegaard has no doubts about his quality.
He told the Premier League: "Obviously we have Bukayo [Saka] and Emile [Smith Rowe] and they are already playing so much.
"But I think one guy who hasn't played that much lately is Gabi Martinelli.
"He's such a big talent, you see him in training every day and you see it. He's a really talented player with a lot of qualities.
"So I think definitely he's one for the future. And he's so young still, so I will go with him."
The Norwegian has backed him to become a fixture for Arsenal as he added: "As I said, he's really young so he just has to keep working hard – as he's doing every day in training.
"He will reach his goals because, from what I see every day in training, he's a top, top talent.
"For him it's just about continuing doing his work and then everything will come for him."
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