Arsenal have plenty of business to tend to this summer. The Gunners need to sign a new striker and a new midfielder, but perhaps their most important piece of business concerns their manager. Indeed, Mikel Arteta is entering the final year of his contract, and the north London club need to tie the Spaniard down to secure his long-term future. Luckily, it sounds as though Arsenal have done just that. Speaking on KS1TV, Steve Kay has claimed that Mikel Arteta’s contract extension has been agreed and that the Arsenal hierarchy want to announce this news as soon as possible. Mikel Arteta has signe…