Arsenal could be set for a busy end to the summer transfer window, with plenty of twists and turns expected before it slams shut this week. The Gunners have already strengthened their backline, adding Riccardo Calafiori to the team for the Premier League campaign ahead. Mikel Merino is expected to be the next Arsenal signing, with the midfielder readying a switch from Real Sociedad. Beyond those two arrivals, there is space for some new signings in the forward ranks, following some departures. Emile Smith Rowe made his way to Fulham earlier in the market, while Eddie Nketiah is set to join Cry…