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When a player has sacks of experience at the highest level, it's no big thing to move him around the pitch.
Legends like Javier Zanetti have impressed pundits and fans alike with their ability to adapt to new positions and provide their managers with more options—but it's not something that you can ask of everybody.
Mateo Kovacic is just 19, but was hotly tipped to be a great player having impressed from a young age at Dinamo Zagreb in his native Croatia. Despite this, he's had a difficult start to life at Inter and his performances have been anything but inspiring of late.
It's not his fault. Kovacic can play in an advanced role or deeper in the midfield, but Mazzarri needs to decide where he wants him and give the young Croat a decent run of games in the same position. Against Chievo, he struggled in the more forward role left open by Fredy Guarin's absence, but most because he was often guilty of drifting back into a more central part of the pitch.
Kovacic could be a great player for Inter, but he'll never settle into life in Serie A if he's moved across the pitch every week. Other players—like Zdravko Kuzmanovic, in particular—were just plain poor against Chievo, but Kovacic looked more uncomfortable than incapable. He deserves a chance to make a position his own.