Tottenham boss Ange Postecoglou admits he was disappointed to only draw at London rivals West Ham on Tuesday. The Australian has challenged his players by insisting ‘we have to maintain our levels’ ahead of their push for Champions League qualification. Spurs took the lead in just the fifth minute at the London Stadium when Timo Werner pulled the ball back for Brennan Johnson to tap in from close range. Tottenham were dominant but West Ham equalised against the run of play when Kurt Zouma headed home from a Jarrod Bowen corner. Both teams pushed for a winner in the second half on an incredibly…