Former Arsenal midfielder, Paul Merson, has hailed the club and their boss, Mikel Arteta for securing the services of Raheem Sterling from Chelsea. He said the England international could be key to the Gunners’ title challenge this season. Sterling left Chelsea for Arsenal on Deadline Day loan deal after being deemed surplus to requirements at Stamford Bridge. Sterling, 29, won countless trophies at Manchester City, but was disappointing at Chelsea. Speaking on Sky Sports, Merson insisted that the former Liverpool forward could help take the load off the likes of Bukayo Saka at the Emirates. “…