Chelsea may face an unexpected setback in this season’s Champions League because of a little-known UEFA regulation. Why Chelsea Could Play Champions League Last-16 Tie at Neutral GroundSource: Getty ImagesAntonio Conte’s team responded to go 2-1 ahead by half-time, only to exit the competition following a dramatic second-half collapse. According to Mail Sport, UEFA rules state that only one Champions League match can take place in the same city on a given night. Another possible workaround could see the Premier League side request to play their match on a Thursday evening instead. “In such a case, the team with the lower ranking in the league phase must play in the alternative venue.