Arsenal were close to agreeing a deal to send young goalkeeper Karl Hein on loan to Charlton Athletic, but in a dramatic turn of events, this deal has changed at the last minute. Hein was Arsenal’s third-choice goalkeeper last season behind David Raya and Aaron Ramsdale, and he played a key role in this year’s pre-season tour in the USA with both of the other goalkeepers absent. The Estonia International agreed a new contract to stay at the club earlier on in the summer, but only on the basis that he would be granted a loan move to play regularly. This led to Hein agreeing to move to League On…