Manchester City and UEFA will square off at the Court of Arbitration for Sport in a battle which could shape the future of European football.
The Premier League champions are appealing a two-year ban from European competitions, handed down by the continent's governing body for what it deemed 'serious breaches' of its controversial Financial fair Play rules.
Should UEFA's ban be upheld, it may well have serious ramifications for City, who would face another battle to stop some of their top names from leaving the club.
However, should City be successful in overturning the ban, UEFA's authority will have been undermined in an unprecedented manner, and serious questions over FFP would likely follow.