Arsenal fans have had to wait a while for their first senior signing of the summer, but now there could well be several in quick succession. In late July, the Gunners signed Italy international defender Riccardo Calafiori from Bologna for a deal said to be worth £42million. However, Arsenal now appear to be making good progress in pursuit of Real Sociedad midfielder Mikel Merino. CaughtOffside recently reported that the Gunners are “set to complete” a deal with the Liga outfit worth around £34million plus bonuses. Now, a report has emerged claiming Arsenal are among those in “pole position” fo…