Former Manchester United star was working as a pundit at Emirates Stadium at the time of alleged assault
The Bundesliga club are interested in signing the 20-year-old from Crystal Palace as they hope to increase their midfield options this summer
Scott Law, 43, of Waltham Abbey, Essex, has pleaded not guilty to a charge of common assault.
Selling Conor Gallagher was one reason Mauricio Pochettino departed the Blues