Arsenal are set to take on Manchester United in a pre-season friendly in Los Angeles, as both sides continue their preparations for the upcoming campaign. Mikel Arteta will have a stronger side to pick from as Gabriel Martinelli, Kai Havertz and Gabriel Magalhaes have now linked up with the squad, but England stars Declan Rice and Bukayo Saka will still be absent. Arsenal are expected to pick a strong side to face Man United, in a repeat fixture of last year’s pre-season clash in New York, which saw Arteta’s side lose 2-0, and Erik ten Hag’s side caused fury with heavy challenges. After severa…