Despite the lingering disappointment of the Porto loss, Mikel Arteta now needs to refocus his Arsenal players for Newcastle United’s visit. Arteta will now surely be reminding his players of the five league wins on the bounce they achieved prior to Wednesday’s defeat. Arsenal remain the most in-form team in the Premier League, and a win over Newcastle could prove a real psychological boost. The 1-0 loss at St. James’ Park earlier this season was embroiled in controversy and was a real set-back for Arteta’s side. Similarly, Arsenal’s defeat away from home at the tail end of last season to Newca…