Former Arsenal midfielder Stewart Robson believes central defence is an area manager Mikel Arteta must address.
The Gunners ended their season on a high, winning the FA Cup against Chelsea and qualifying for the Europa League.
But Robson does not believe the team can push for a top four position with the likes of Rob Holding in defence.
"They've still got to get good centre-halves," Robson told ESPN.
"Holding I think proved that he's not going to be quite good enough. Every time someone ran at him they got past him. David Luiz is past his best and still got mistakes in him.
"Sokratis [Papastathopoulos] isn't going to be there I would imagine for too much more, won't get many games. Kolasinac I'm not sure he's quite good enough to make Arsenal go to that next level.
"A good quality centre-half who is good in the air and can defend well, that's got to be their priority."
