The midfielder has been linked with Tottenham and former club AS Roma.
Inzaghi said: “Over the year and a half he’s been here, (Frattesi) has played a big part in my view.
“We’ve gotten to where we want to be,” the Inter coach continued. “And that’s partly thanks to him.
“He looks very good in training to me.
“I heard from somewhere that he and I had a bust-up. If I were him, I’d stay here.”
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