By Tom Gott Mikel Arteta has shrugged off claims that Arsenal have already fallen too far behind in the Premier League title race after Saturday’s 1-0 defeat to Newcastle United, and has challenged his players to step up their level. Arteta’s side now find themselves on a three-game winless streak in the Premier League after Alexander Isak’s 12th-minute header handed all three points to the Magpies and saw Arsenal drop points for the fifth time this season. While the season is only ten games old, previous campaigns have shown just how narrow the margins are in the Premier League title race. Ci…