A long-serving Arsenal star who is set to officially seal a transfer in the coming days has been tipped to make a massive impression at his new club. The Gunners have already signed Riccardo Calafiori and are locked in talks to sign Mikel Merino from Real Sociedad to bolster their ranks in midfield, while there have also been talks that they could snap up an attacker before the conclusion of the summer transfer window. Arsenal have also been active in terms of outgoings as they aim to trim their squad to fund potential signings, with Albert Sambi Lokonga, Nuno Tavares, Mohamed Elneny and Cedri…