Now, they must push their attention back to the league and their fight with Aberdeen to finish second in the Scottish Premiership.
There are five games remaining and the Gers have to visit Celtic Park and Pittodrie and only have two home games remaining.
The news was confirmed on Tuesday, following a brief statement from the club.
The statement said Rangers are looking into a “team-related incident”.
The Ibrox club also say they will “make no further comment until this investigation has been completed”.
Our unique algorithm has predicted the Rangers side it believes will start the game.
Football Whispers uses data to predict teams’ starting XIs, taking into account injuries, suspensions, the statistical likelihood of a player being selected, the competition the match is in, players’ previous performances and the opponent’s style.
And you can also give it a go yourself. Just click ‘create your own’ on the line-up at the top of the page and pick your ideal XI for the game.You can also see each player’s stats once you’ve selected them.
When you’re happy with your team, press confirm and you’ll be able to share it with your friends via social media.