Felix is accessible on loan for the rest of the season. He has fallen out of favour under Diego Simeone at Atletico Madrid.
Arsenal are keen on signing each a striker and a large player. Atletico would demand a big loan fee to facilitate a deal.
Ndicka is out of contract at Eintracht Frankfurt at the tip of the season. Arsenal are linked with a possible pre-contract agreement, signing him on a free transfer in the summertime.
Nonetheless, while the window is open, the prospect of a deal happening this month can’t be ruled out. Frankfurt could also be keen to recruit some money for the Frenchman to forestall losing him for nothing.