Bayern Munich defender, Eric Dier, has named Bukayo Saka, Gabriel Martinelli and Leandro Trossard as the three Arsenal players his team-mates need to watch in their Champions League quarter-final. The Gunners welcome the Bundesliga giants in the first leg on Tuesday night. Dier is set to start for the visitors after joining them from Tottenham in the January transfer window. His time in North London, means he has valuable knowledge on what Bayern can expect to face over the two legs. And Dier believes that it is Arsenal’s forwards who will cause his side the most problems. “We’ll have to be ca…