Arsenal have now completed their pre-season trip to the United States following their game on Thursday night. Mikel Arteta‘s side were served their first defeat of pre-season against Arne Slot’s Liverpool in Philadelphia. The Gunners will now be set to return to north London where the action will not stop with more transfers being eyed ahead of the season opener. Edu Gaspar has only been able to bring in Riccardo Calafiori this summer but Mikel Merino remains a player Arsenal are interested in. But there is also some in-house business which the Gunners need to address with Arteta’s contract no…