luiz adriano scored nine times for shakhtar donetsk in europe this season .
the brazilian is out of contract at the end of the year ... both arsenal and liverpool are interested in signing the 27-year-old .
cristiano ronaldo and lionel messi have netted eight goals this season .
real madrid and barcelona both in the champions league semi-finals .
read : our reporters have their say on who will win the champions league .
click here for sportsmail 's guide to the champions league final four .