Arsenal are likely to be busy in the last three weeks of the summer transfer window as Edu and Mikel Arteta look to apply the finishing touches to their squad. The Gunners will be raring to go again in the Premier League title race while also improving on their run to the Champions League quarter-finals last term. Arsenal have made one senior signing so far, bringing Riccardo Calafiori to the Emirates Stadium from Bologna. The Gunners are currently also being linked with a new midfielder – Mikel Merino is said to be a key target – as well as some attacking reinforcements. For instance, the lik…