Arsenal have started the new Premier League season with two wins as the transfer window closes, looking in ominous shape to retain the crown they won for the first time in 22 years last season. Have their main rivals done enough to prevent Mikel Arteta's side winning a second successive title? Manchester City have undergone heavy transition, from manager Pep Guardiola being replaced after 10 years by Enzo Maresca, to the departure of key figures in their glory years such as Rodri, Bernardo Silva, John Stones and Jack Grealish, as well as Savio, Omar Marmoush, Nico Gonzales, James Trafford, Nathan Ake and Tijjani Reijnders.