#2 Ainsley Maitland-Niles
The 21-years-old has been one of the unluckiest players in the whole Arsenal squad as the English winger has never got to play in his natural position, right-wing. This season due to Bellerin's injury and Lichtsteiner's poor form, Maitland-Niles has covered the right-back position for the Gunners.
It is the best decision for both parties as Reiss Nelson will be returning from his loan spell at the end of the season from Hoffenheim and would be considered for that winger spot over Maitland-Niles. He is 21 and could restart his career with any other club.
For Arsenal, they could get a decent amount of money Niles if they put him on the summer transfer list. If at all Niles wouldn't want to leave his boyhood club, a loan spell for 2-3 years could be an option for that kind of situation.