Arsenal host London rivals Tottenham in the Premier League on Sunday after their heavy loss at Bayern Munich in midweek. Per Mertesacker has warned his Arsenal team-mates improvement is needed against Tottenham if they are to maintain their Premier League title bid. Arsenal welcome Tottenham to the Emirates for Sunday's north London derby, four days after suffering a humiliating 5-1 defeat against Bayern Munich in the Champions League. Wednesday's rout in Munich left Arsenal on the brink of elimination and centre-back Mertesacker stressed the importance of avoiding another damning loss. "We will learn a lot from this game, we must learn a lot and we have to play better against...
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