Arsenal may be about to exploit a financial fair play loophole that could generate an extra £90m for Mikel Arteta’s transfer budget. The Gunners are preparing to go again after narrowly missing out on a first Premier League title for 20 years in 2023-24. That will of course require significant investment in the playing squad. But, like almost every other Premier League club at the moment, they are grappling with Profit and Sustainability Rules (formerly financial fair play, or FFP). A new set of rules encompassing a financial anchoring system and squad cost control ratio are set to be implemen…