#4 Error prone
There is no doubt that Arsenal have signed a fantastic goalkeeper entering his prime years, but Leno has a history of making costly errors.
In fact, since the start of the 2015-16 Bundesliga season, only Oliver Baumann (10) has committed more errors leading to an opposition goal than Leno (9).
Leno started Germany’s first game of the 2017 Confederations Cup against Australia and made two mistakes in an eventual 3-2 win. After that game, Marc-André ter Stegen of Barcelona took his place in the side till the end of the tournament.
One of Leno’s most famous mistakes happened in a Bundesliga game against Augsburg when he completely misjudged a simple back pass from Jonathan Tah and let the ball roll past him into the net.