He was in action in pre-season as David Raya and Aaron Ramsdale delayed their return to the club after being given extended breaks.
The 22-year-old has been at Arsenal since 2018 and has never appeared in goal in the Premier League for them.
However, he already has 30 caps for Estonia, which proves he is a good player who would probably start at another club.
Arsenal wants to keep him and is not looking to sanction a permanent transfer this summer.
The Gunners will allow him to leave on loan, and a report in Football League World claims Charlton is leading the race for his signature.
There are other clubs willing to take him out on loan, but Charlton Athletic will win the race unless Hein decides not to join them.
Just Arsenal Opinion
Karl Hein needs game time, and we already have two good goalkeepers ahead of him, so he will struggle to play if he stays.
A loan move will help to develop him further and also preserve his value for us if we decide to cash in on him next summer.
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Apparently he is off to Real Valladolid now
Hopefully as first choice otherwise he may as well have gone to Charlton
Would have liked to have seen him given a chance to be back up to Raya this season.
The situation with Hein is really quite bizarre, isn’t it. Here’s a young keeper with far more international appearances for his country than he has club appearances. He must be unique in that surely.
He certainly needs to get that vital club-related experience. We’ll see whether that’s at Charlton or the somewhat more exotic Real Valladolid which is owned by Ronaldo (the Brazilian one). I suspect he’d prefer the sunshine of Spain.
He would have been a good backup . I was impressed by him as he was giving me Martinez vibes .