Marin arrived on loan from Chelsea over the summer.
Montella said: "Marko is growing and has very important qualities. We will see him on the pitch tomorrow, but I don't know for how long.
"He is a player who started out wide, but can also play behind the strikers. A lot depends on the attitude of the team overall. As far as we are concerned, he's more of a provider of through balls than a winger."
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