EXCLUSIVE CONTENT Get ESPN+ Insider panel: Prem transfer takeawaysManchester United paid big money for 19-year-old Anthony Martial. Will he pan out at Old Trafford? John Peters/Man Utd via Getty ImagesFC Insider PanelSep 2, 2015, 02:30 PM ETEmailWith the 2015 summer transfer window closed, it's time to take a look at key takeaways for Premier League teams and players.