Edin Dzeko grabbed the winner in injury-time.
“Obviously, I prefer a very different type of performance, but this is a difficult period of the season and the windy conditions did not help either team to play good football," Di Francesco told Sky Sport Italia.
“Frosinone are scrapping for every point to secure safety and I know what that is like. We made too many mistakes and should've approached the game better, as we risked a draw or even a defeat. We always find a way to make life more complicated for ourselves with distractions.
“The positive from this evening is that we won, but I do hope he can start to play much better football from now on. The second goal came from our own set play and our positioning was off, Daniele De Rossi misread the situation.
“We had the game in hand and should've finished it off rather than just tried to control it. We've shown over the season that we are a team capable of scoring goals, but also of conceding them. We've got to improve and we can't keep getting away with this type of performance.
“I was impressed not just by Dzeko's goals, but above all the way he tried to drag everyone forward, to lead the team on the field. He always has to do that."
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