City's Bernardo Silva and Mateo Kovacic both misfired in the shootout to put Madrid in the driving seat
"Following tests carried out on Gareth Bale by Real Madrid medical staff he has been diagnosed as suffering an injury to the right pyramidalis muscle," said a Real statement.
The 25-year-old was an unused substitute in Real’s 5-0 victory over Levante in La Liga on Saturday.