Antonio di Natale is convinced of big things from Udinese teammate Luis Muriel.

Muriel has returned from his loan spell at Lecce.

"He had a great campaign at Lecce and has so much quality, but obviously he needs to work hard. In a year or two, he could become like Alexis Sanchez. It's true he arrived a little heavy at pre-season training, but he is young and can only get better," said Di Natale.