That’s according to ex-Gunners ace Stewart Robson who says Ivan Perisic would be savvy acquisition.
However, the the retired midfielder insists Emery really needs fresh options at the back.
The Spaniard has mounting injury issues with Sokratis Papastathopoulos ruled out for a month.
Rob Holding and Hector Bellerin are both already long-term casualties.
Arsenal want Manchester United star Eric Bailly, 24, on loan for the rest of the season with a purchase option included in the deal.
But despite Emery’s overtures, United rebuffed the approach with Old Trafford chiefs seemingly reluctant to do business with a rival.
Inter Milan winger ace could be north London bound after pushing for a San Siro exit.
Robson says the Croatia international won’t be Emery’s priority.
“Perisic is a very, very good player,” he told LoveSport Radio.
“We saw that at the World Cup, we’ve seen it for Inter Milan over the years, and he would be a good addition to Arsenal’s squad.
“You still think they’ve got to sort out their defensive problems.
“But he probably can’t buy the players he wants short-term.
“I think you’ll see Arsenal buy centre-halves come the summer transfer window.”
Arsenal lost 3-1 to Manchester United in the FA Cup on Friday.
Robson reckons serious defensive lapses are still costing his former side.
“One or two of the defensive issues haven’t been resolved – the game against Manchester United was a great example,” he added.
“Arsenal played quite well in certain aspects of the game, but the decision making of the centre-backs for all three of the Manchester United goals weren’t good enough.
“That hasn’t changed under Unai Emery – I think there’s a bit more structure about the team’s play, there’s been more aggression with the way they defend higher up the field, and there have been good defensive displays.
“The Liverpool home game, the Tottenham home game to a certain degree, Chelsea at home – those three games where Arsenal pressed the ball, they were dynamic in midfield, they made good decisions at the back most of the time.
“But against Manchester United and against Liverpool away, we saw the same old Arsenal – bad decisions.