Arsenal could find themselves heading off on their pre-season tour of the United States without a single new signing. Mikel Arteta may well be growing impatient as Arsenal‘s wait to see thier first summer addition goes on. The Gunners have been trying to get a deal for Riccardo Calafiori over the line for weeks now but to no avail. It is claimed Calafiori has already agreed personal terms with Arsenal on a five-year deal, but the two clubs are still discussing the financial outlay. As things stand, the wait goes on as the north London side eye up other opportunities in the window. And one may …