Arsenal are working on a deal to sign Real Madrid midfielder Martin Odegaard on a permanent transfer for a fee in the region of £30m.   There is still work to be done to get the deal completed for the 22-year-old, who spent the second half of last season on loan at the Emirates.   Odegaard, who joined Real Madrid in 2015, has only made eight league appearances for the Spanish side and has also spent time on loan at Heerenveen, Vitesse and Real Sociedad before the spell with Arsenal.   The Norway international made 20 appearances and scored two