The 19-year-old right winger has caught the eye in the Bundesliga this term.
He has been a regular at Koln, scoring once and providing two assists during his 26 top-flight appearances.
And despite his stats not being outstanding, his displays have captured the attention of Mikel Arteta.
Now Tag 24 states that Koln are willing to cash in if they receive an offer of £12.5m.
Arsenal have been doing as much homework as possible on the ace.
They have been in contact with Lukas Podolski, the forward that played for both clubs, to “inquire about the winger".
And a good review could lead to them launching a swoop at the bargain price.
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