Arsenal could be about to make their next major signing of the summer transfer window after landing Riccardo Calafiori. Arsenal haven’t been mega busy this summer, making just one new permanent senior signing so far, but the next arrival may not be too far away. Indeed, Arsenal are closing in on a deal to sign Mikel Merino. Personal terms with Merino are said to have been agreed, and now, the Gunners just need to agree a fee and finalise the terms. According to The Mirror, it may not be too long until there’s some serious progress made on this deal. READ MORE: Martin Odegaard shares what he re…