#2 Alexis Sanchez
Alexis Sanchez does like to score a lot of goals and he's certainly known for that trait, but another quality of his makes him unique - his wonderful work-ethic. And Arsenal would hate to lose a player of his quality this summer.
The Chilean has often carried Arsenal's goalscoring demands on his own back ever since joining from Barcelona in 2014 and he hasn't let anyone down. He dislodged Olivier Giroud from the striker's position up front and made it his own last season, scoring 22 times in the Premier League. His willingness to give his all for the cause of winning matches the trademark South American traits and Sanchez thrives on that. And that's a vital reason for as to why Arsenal fans adore him.
While rumours are linking him with moves to PSG, Bayern Munich and Manchester City, Arsene Wenger will find it incredibly tough to sign a player of his calibre. His replacement may score some goals, but won't have as much determination as him.