Manchester City defender Kyle Walker has called for tough action to tackle online abuse after he received a "vile, racist and threatening" message following Wednesday's 2-0 loss at Juventus. Walker played the whole Champions League match in Turin but could not help Pep Guardiola's team avoid a seventh defeat in 10 matches. The England international posted a screenshot of a message he received on Instagram from an unnamed user to his social media accounts on Thursday that used obscene racist language.