Arsenal manager Mikel Arteta still believes his side can reach the Carabao Cup final - but says his players must first master the "tricky" ball used in the competition.
The Gunners were beaten 2-0 by Newcastle in Tuesday's semi-final first leg after goals from Alexander Isak and Anthony Gordon.
Arsenal had 23 shots during the match but just three were on target, as Gabriel Martinelli struck the post and Kai Havertz headed a simple chance wide.
When he was asked about the missed chances in his post-match news conference, Arteta said he would not tell his players to change anything, but did mention the impact the ball had.