Gabriel Jesus has hit the ground running since his £45m move from Manchester City, while an ambitious summer recruitment drive has also seen Matt Turner, Marquinhos, Fabio Vieira and Oleksandr Zinchenko join the club.
Still, Sky Sports pundit Keane believes the manner in which Arsenal were overtaken by bitter rivals Tottenham last season suggests there is still work to be done at the Emirates Stadium.
While it was a hugely promising campaign for Arteta’s young team, an end-of-season capitulation allowed Antonio Conte’s Spurs side to pip them into fourth spot, condemning Arsenal to a season in the Europa League.
“They blew it, they got into a great position, four, five games to go in the season you think they’re in pole position and they blew it.
“They couldn’t get over the line. They were poor, the Newcastle game was a real blow to them where they never turned up.
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“The manager was quite critical of them after the game, some of the players were – senior ones – so you wouldn’t be putting any bets on Arsenal to finish top four next season because the other teams.
“Manchester United will get better you’d of thought. Tottenham will be stronger, so you can’t see it for Arsenal, big set-back.
“Arsenal should be competing for top-four so to come up short and finish behind Tottenham was a hammer blow.
“There’s still a softness to the group. Okay, they’re young and sometimes you need experienced lads to get you over the line in the big games. But there’s a softness to them, even the two centre-halves, they’re not convincing.”