If last week’s Premier League defeat against Tottenham Hotpsur was damaging, over the course of 90 minutes against Newcastle on Monday, Arsenal’s Champions League hopes were all but extinguished. What really hurts for Arsenal’s fans is that before those two games, the club had been shaping up to announce its return to the top of European football. The 2-0 defeat at St James’ Park — a performance midfielder Granit Xhaka described as a “disaster” — delivered a huge blow to Arsenal’s chances of finishing in the Premier League top four as the Gunners remain two points behind Tottenham with one game left to play. To regain fourth position and qualify for the Champions League, Arsenal will realistically need to beat Everton on Sunday and hope bottom side Norwich — without a win in six Premier League games — can pull off an unlikely victory against Tottenham. But as things stand, Monday’s lackluster defeat appears costly.