'Perfectionist' Thomas Tuchel pitching Chelsea's path to glory ahead of Champions League final with obsessive coach known to place tactics, the opposition and even the field of play under his microscope

Lawn-mowers in Porto have never chuntered under such scrutiny.

The wide eyes of Thomas Tuchel are in town and these final hours before Saturday's Champions League final could be decisive. For Chelsea and Manchester City. For the local groundsmen, too.

Just ask Christian Heidel - the man who, in 2009, gave Tuchel his first senior manager's job at German side Mainz 05.

'Thomas is an absolute perfectionist. That concerns every aspect of his job - every training has to be perfect, every game has to be perfect,' says Heidel.