Arsenal are set to bank a £35m financial boost that will reinforce Mikel Arteta’s transfer budget in coming seasons. The Gunners have spent big over the last two seasons in particular, with a net outlay of almost £300m. This summer, they have already made David Raya’s loan move from Brentford permanent in a deal worth £27m. Now, Bologna defender Riccardo Califiori is set to become Arsenal’s second addition of the transfer window. This free-spending approach is a departure from the norm for Arsenal, whose owner Stan Kroenke has historically wanted to pursue a self-sufficient model. The 76-year-…