Mikel Arteta now has a huge decision to make after an issue with Leandro Trossard was exposed as Arsenal lost to Aston Villa. Leandro Trossard was named in the starting line-up as Arsenal welcomed Aston Villa to the Emirates Stadium on Sunday afternoon. Mikel Arteta handed the Belgian attacker just his twelfth Premier League start of the season so far against the Midlands outfit. Trossard had earned this opportunity with his recent performances off the bench for the North London club. He came on off the bench against Bayern Munich and Brighton, in each of his last two matches, to make a goalsc…