Arsenal sign highly-rated teenager, but he won't join immediately

Arsenal have signed a teenage winger who has been compared to Khvicha Kvaratskhelia. The deal is done, but he won't link up with the club straight away. The player is highly rated and the move is one for the future rather than the current squad. No fee or arrival date has been confirmed. Arsenal have been stacking up young talent in recent windows, and this looks like another one for the long game.