Rangers manager Pedro Caixinha has warned his players to avoid wearing green boots "because it is the colour of Celtic".
The 46-year-old, appointed Gers boss in March, is keen to lay out a few ground rules ahead of his first full campaign in charge at Ibrox.
Caixinha has taken a zero-tolerance approach to his players sporting the colours of arch rivals Celtic, while also revealing that an inspirational slogan will be stamped on the stadium walls.
A document put together by the Portuguese, as quoted by the Daily Post, reads: "From today, no-one will wear boots of that colour because it is the colour of Celtic.
"The slogan 'We are the People' will be stamped on the walls for both our players and opponents to feel the strength of Rangers."
Rangers are already back in action following a short summer break, earning a 1-0 win over Progres Niederkorn in the first-round qualifiers of the Europa League on Thursday.