Unai Emery is hopeful of getting the deal over the line but Arsenal's bid of £55m paid upfront and £10m in add-on is still short of the Eagles' valuation.

However, The Independent is reporting that Palace could also be interested in the possibility of having Nigeria-eligible winger Bukayo Saka coming over on loan as an alternative to Nelson.

Saka's performances for Arsenal especially in last season's UEFA Europa League have always drawn the attention of some European clubs.

The winger was in action for 63 minutes in Arsenal's recent International Champions Cup match against Fiorentina along with fellow Nigerian James Olayinka.