The Pole went into the season with big doubts over his future.
"He comes off the line much more to claim the ball," Wenger told Arsenal Player. "His movement to take the ball at the peak is much better and he has shown that especially in the last two games against Swansea and Napoli when it was needed to come off the line and take a cross.
"It sometimes has a psychological impact on an opposing team when a goalkeeper comes to claim a cross or is quick off his line."
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