Martin Odegaard has reportedly already been to Arsenal’s training ground at London Colney to complete his media duties before his move to Arsenal is made official.

Arsenal are expected to announce Martin Odegaard as a permanent Arsenal player in time for the midfielder to face Chelsea in the Premier League on Sunday. As a guess, they will likely announce him late on Friday afternoon as that seems to be a favourite time for them to make announcements.
On Wednesday afternoon, Chris Wheatley tweeted to say, “Martin Odegaard left London Colney training ground around 30 minutes ago after undergoing his media duties.”
https://twitter.com/ChrisWheatley_/status/1428010676547686407
The Athletic reported on Tuesday night that Arsenal and Real Madrid were close to agreeing a deal for the permanent transfer of Martin Odegaard. It hasn’t yet been finalised, but, as stated above, the fee is expected to be in the region of €35m (£29.9m).
Find out more about the deal and everything else here:
Martin Odegaard to Arsenal details: Fee, deal length, buyback clause