Passing Accuracy
The ability to pass it out is vital for a modern goalkeeper. Chelsea, like every other top team, prefer to build their attacks from the back and ensuring you have a keeper who is capable with the ball at his feet is important.
Based on this metric, Donnarumma is the superior passer. Assessing their pass completion numbers in the league over the last two and a half years, the Milan keeper has completed 78.06% of his passes, while Mendy has managed just 70.1%.