Arsene Wenger has identified how to ensure Arsenal concede fewer goals from set-pieces - buy taller players.
The north Londoners shipped 43 goals last season, with the majority coming from set plays, and Wenger is determined to correct this in time for the new campaign.
"We conceded very few goals from open play, most of them were from set pieces in a way you don't want to concede goals," said the Arsenal boss.
"It's something that's easy to correct. We need to improve the size of our squad. We need a bigger variety in the height of our players. We need to be more capable of fighting against some characteristics than we have been this season."
Arsenal have been linked with a number of potential acquisitions to provide them with some aerial dominance - including Gary Cahill and Mamadou Sakho - and are expected to reinforce their defence during the transfer window.
But how much money Arsenal will have at their disposal remains to be seen and, with Bolton centre-back Cahill reportedly commanding a fee of £20 million, the Gunners could be priced out of a move for him.
Paris Saint-Germain giant Sakho would appear to be a more realistic option for Arsenal, with the languid France international seemingly possessing the attributes Wenger favours in a player.
Arsenal are also expected to draft in another striker to provide support for the injury-prone Robin van Persie.