Ruben Uria, Goal.com : Lionel Messi has demanded to leave Barcelona by activating a clause in his contract that would allow him to leave on a free transfer. The 33-year-old has sent a fax to Barcelona communicating his intention to leave behind the club he's played at for 20 years. Although his contract is set to expire at the end of the 2020-21 season, Messi and his legal team believe the clause will