The former Barcelona and Bayern Munich boss has rarely appeared without the symbol attached to his garment in recent months, but what does it mean?
Towards the end of 2017, Manchester City manager Pep Guardiola began to wear a yellow ribbon on his chest.
He wore it to press conferences and also on the side of the pitch in both the Premier League and Champions League.
It soon became a talking point as supporters and the media wondered what it meant and why he wore a yellow ribbon. Some of his rivals even passed comment.
Managers wear all sorts of symbols on their chests, but what exactly is Guardiola's all about?