The Neroverdi have been one of Italian football's success stories in recent years, rising from Serie C1 up to the top flight and last season qualified for the Europa League by finishing sixth.
However, they have struggled for consistency this time around and a run of one win in their last five games has left them sat in 13th place ahead of Sunday's trip to Roma.
Di Francesco admits his players seem to have gone stale this term and is growing frustrated by their lack of determination to continue to improve.
"I hope to see a dynamic and incisive Sassuolo side with more determination both when attacking and defending," he told the press. "We don't convert enough of our chances in attack and you cannot buy that kind of determination.
"You might be able to improve it in training. We give options to the players, but they have to be mentally ready for the games."